diff --git a/presentation.html b/presentation.html
index 1604b44..0a76855 100644
--- a/presentation.html
+++ b/presentation.html
@@ -8,7 +8,7 @@
 <link href="presentation_files/libs/quarto-html/quarto-html.min.css" rel="stylesheet" data-mode="light">
 <link href="presentation_files/libs/quarto-html/quarto-syntax-highlighting.css" rel="stylesheet" id="quarto-text-highlighting-styles"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <meta charset="utf-8">
-<meta name="generator" content="quarto-1.0.37">
+<meta name="generator" content="quarto-1.1.189">
 <meta name="author" content="Ed Burn">
 <title>R packages</title>
 <meta name="apple-mobile-web-app-capable" content="yes">
@@ -19,10 +19,15 @@
 <style>
     code{white-space: pre-wrap;}
     span.smallcaps{font-variant: small-caps;}
-    span.underline{text-decoration: underline;}
-    div.column{display: inline-block; vertical-align: top; width: 50%;}
+    div.columns{display: flex; gap: min(4vw, 1.5em);}
+    div.column{flex: auto; overflow-x: auto;}
     div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
     ul.task-list{list-style: none;}
+    ul.task-list li input[type="checkbox"] {
+      width: 0.8em;
+      margin: 0 0.8em 0.2em -1.6em;
+      vertical-align: middle;
+    }
     pre > code.sourceCode { white-space: pre; position: relative; }
     pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
     pre > code.sourceCode > span:empty { height: 1.2em; }
@@ -495,7 +500,7 @@
 <div class="cell">
 <div class="sourceCode" id="cb13"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="va">measurement_summary</span><span class="op">&lt;-</span><span class="kw">function</span><span class="op">(</span><span class="va">data</span>, <span class="va">var</span>, <span class="va">groupings</span><span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/c.html">c</a></span><span class="op">(</span><span class="st">"species"</span>, <span class="st">"sex"</span><span class="op">)</span><span class="op">)</span><span class="op">{</span></span>
 <span><span class="va">data</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span> </span>
-<span>  <span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span> </span>
+<span>  <span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="fu"><a href="https://tidyselect.r-lib.org/reference/all_of.html">all_of</a></span><span class="op">(</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span> </span>
 <span>  <span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html">summarise</a></span><span class="op">(</span>min <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">min</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>            median <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/stats/quantile.html">quantile</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, <span class="fl">0.5</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>            max <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">max</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
@@ -565,7 +570,7 @@
 <div class="cell">
 <div class="sourceCode" id="cb22"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="va">measurement_summary</span><span class="op">&lt;-</span><span class="kw">function</span><span class="op">(</span><span class="va">data</span>, <span class="va">var</span>, <span class="va">groupings</span><span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/c.html">c</a></span><span class="op">(</span><span class="st">"species"</span>, <span class="st">"sex"</span><span class="op">)</span><span class="op">)</span><span class="op">{</span></span>
 <span>  <span class="va">data</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
-<span>    <span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
+<span>    <span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="fu"><a href="https://tidyselect.r-lib.org/reference/all_of.html">all_of</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
 <span>    <span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html">summarise</a></span><span class="op">(</span>min <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">min</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     median <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/stats/quantile.html">quantile</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, <span class="fl">0.5</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     max <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">max</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
@@ -586,7 +591,7 @@
 <div class="cell">
 <div class="sourceCode" id="cb25"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="va">measurement_summary</span><span class="op">&lt;-</span><span class="kw">function</span><span class="op">(</span><span class="va">data</span>, <span class="va">var</span>, <span class="va">groupings</span><span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/c.html">c</a></span><span class="op">(</span><span class="st">"species"</span>, <span class="st">"sex"</span><span class="op">)</span><span class="op">)</span><span class="op">{</span></span>
 <span>  <span class="va">data</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
-<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
+<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="fu"><a href="https://tidyselect.r-lib.org/reference/all_of.html">all_of</a></span><span class="op">(</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
 <span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html">summarise</a></span><span class="op">(</span>min <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">min</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     median <span class="op">=</span> <span class="fu">stats</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/stats/quantile.html">quantile</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, <span class="fl">0.5</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     max <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">max</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
@@ -596,7 +601,7 @@
 <div class="cell">
 <div class="sourceCode" id="cb26"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="va">measurement_summary</span><span class="op">&lt;-</span><span class="kw">function</span><span class="op">(</span><span class="va">data</span>, <span class="va">var</span>, <span class="va">groupings</span><span class="op">=</span><span class="fu"><a href="https://rdrr.io/r/base/c.html">c</a></span><span class="op">(</span><span class="st">"species"</span>, <span class="st">"sex"</span><span class="op">)</span><span class="op">)</span><span class="op">{</span></span>
 <span>  <span class="va">data</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
-<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
+<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="fu"><a href="https://tidyselect.r-lib.org/reference/all_of.html">all_of</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
 <span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html">summarise</a></span><span class="op">(</span>min <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">min</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     median <span class="op">=</span> <span class="fu">stats</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/stats/quantile.html">quantile</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, <span class="fl">0.5</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     max <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">max</a></span><span class="op">(</span><span class="op">{</span><span class="op">{</span> <span class="va">var</span> <span class="op">}</span><span class="op">}</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
@@ -676,7 +681,7 @@
 <span>  <span class="fu">checkmate</span><span class="fu">::</span><span class="fu"><a href="https://mllg.github.io/checkmate/reference/AssertCollection.html">reportAssertions</a></span><span class="op">(</span>collection <span class="op">=</span> <span class="va">errorMessage</span><span class="op">)</span></span>
 <span></span>
 <span>  <span class="va">data</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
-<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
+<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="fu"><a href="https://tidyselect.r-lib.org/reference/all_of.html">all_of</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
 <span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html">summarise</a></span><span class="op">(</span>min <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">min</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu">rlang</span><span class="fu">::</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     median <span class="op">=</span> <span class="fu">stats</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/stats/quantile.html">quantile</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu">rlang</span><span class="fu">::</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, <span class="fl">0.5</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     max <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">max</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu">rlang</span><span class="fu">::</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
@@ -694,6 +699,9 @@
 <div class="sourceCode" id="cb33"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">usethis</span><span class="fu">::</span><span class="fu"><a href="https://usethis.r-lib.org/reference/use_package.html">use_package</a></span><span class="op">(</span><span class="st">"checkmate"</span><span class="op">)</span></span>
 <span><span class="fu">usethis</span><span class="fu">::</span><span class="fu"><a href="https://usethis.r-lib.org/reference/use_package.html">use_package</a></span><span class="op">(</span><span class="st">"glue"</span><span class="op">)</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 </div>
+<h3 id="insert-a-roxygen-skeleton-there-is-two-options">Insert a Roxygen skeleton, there is two options:</h3>
+<h3 id="place-your-cursor-anywhere-in-the-function-you-want-to-document-and-click-code-tools---insert-roxygen-skeleton">1) Place your cursor anywhere in the function you want to document and click Code Tools -&gt; Insert Roxygen Skeleton</h3>
+<h3 id="place-your-cursor-anywhere-in-the-function-you-want-to-document-and-use-the-keyboard-shortcut-ctrlshiftaltr">2) Place your cursor anywhere in the function you want to document and use the keyboard shortcut Ctrl+Shift+Alt+R</h3>
 <p><br></p>
 <div class="fragment">
 <div class="cell">
@@ -734,20 +742,24 @@
 <span>  <span class="fu">checkmate</span><span class="fu">::</span><span class="fu"><a href="https://mllg.github.io/checkmate/reference/AssertCollection.html">reportAssertions</a></span><span class="op">(</span>collection <span class="op">=</span> <span class="va">errorMessage</span><span class="op">)</span></span>
 <span></span>
 <span>  <span class="va">data</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
-<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
+<span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by</a></span><span class="op">(</span><span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/across.html">across</a></span><span class="op">(</span><span class="fu"><a href="https://tidyselect.r-lib.org/reference/all_of.html">all_of</a></span><span class="op">(</span><span class="va">.env</span><span class="op">$</span><span class="va">groupings</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html">%&gt;%</a></span></span>
 <span>    <span class="fu">dplyr</span><span class="fu">::</span><span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html">summarise</a></span><span class="op">(</span>min <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">min</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu">rlang</span><span class="fu">::</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     median <span class="op">=</span> <span class="fu">stats</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/stats/quantile.html">quantile</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu">rlang</span><span class="fu">::</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, <span class="fl">0.5</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span>,</span>
 <span>                     max <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Extremes.html">max</a></span><span class="op">(</span><span class="op">!</span><span class="op">!</span><span class="op">!</span><span class="fu">rlang</span><span class="fu">::</span><span class="fu"><a href="https://rlang.r-lib.org/reference/sym.html">syms</a></span><span class="op">(</span><span class="va">var</span><span class="op">)</span>, na.rm<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
 <span><span class="op">}</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 </div>
 </div>
+</section><section id="to-update-the-documentation-and-export-the-function" class="slide level2"><h2>To update the documentation and export the function</h2>
+<div class="cell">
+<div class="sourceCode" id="cb35"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">devtools</span><span class="fu">::</span><span class="fu"><a href="https://devtools.r-lib.org/reference/check_man.html">check_man</a></span><span class="op">(</span><span class="op">)</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+</div>
 </section><section id="testing" class="slide level2"><h2>Testing</h2>
 <div class="cell">
-<div class="sourceCode" id="cb35"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">usethis</span><span class="fu">::</span><span class="fu"><a href="https://usethis.r-lib.org/reference/use_r.html">use_test</a></span><span class="op">(</span><span class="st">"measurement_summary"</span><span class="op">)</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
+<div class="sourceCode" id="cb36"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">usethis</span><span class="fu">::</span><span class="fu"><a href="https://usethis.r-lib.org/reference/use_r.html">use_test</a></span><span class="op">(</span><span class="st">"measurement_summary"</span><span class="op">)</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 </div>
 </section><section id="testing-1" class="slide level2"><h2>Testing</h2>
 <div class="cell">
-<div class="sourceCode" id="cb36"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">test_that</span><span class="op">(</span><span class="st">"check summary"</span>, <span class="op">{</span></span>
+<div class="sourceCode" id="cb37"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="fu">test_that</span><span class="op">(</span><span class="st">"check summary"</span>, <span class="op">{</span></span>
 <span>  <span class="kw"><a href="https://rdrr.io/r/base/library.html">library</a></span><span class="op">(</span><span class="va"><a href="https://allisonhorst.github.io/palmerpenguins/">palmerpenguins</a></span><span class="op">)</span></span>
 <span>  <span class="va">result</span> <span class="op">&lt;-</span> <span class="fu">measurement_summary</span><span class="op">(</span><span class="va">penguins</span>,</span>
 <span>                                var<span class="op">=</span><span class="st">"bill_length_mm"</span>,</span>
@@ -761,7 +773,7 @@
 </div>
 </section><section id="testing-2" class="slide level2"><h2>Testing</h2>
 <div class="cell">
-<div class="sourceCode" id="cb37"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="kw"><a href="https://rdrr.io/r/base/detach.html">detach</a></span><span class="op">(</span><span class="st">"package:PenguinSummary"</span>, unload<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span></span>
+<div class="sourceCode" id="cb38"><pre class="downlit sourceCode r code-with-copy"><code class="sourceCode R"><span><span class="kw"><a href="https://rdrr.io/r/base/detach.html">detach</a></span><span class="op">(</span><span class="st">"package:PenguinSummary"</span>, unload<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span></span>
 <span><span class="fu">devtools</span><span class="fu">::</span><span class="fu"><a href="https://devtools.r-lib.org/reference/test.html">test_coverage</a></span><span class="op">(</span><span class="op">)</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
 </div>
 <div class="footer footer-default">
@@ -1070,7 +1082,8 @@
       for (var i=0; i<noterefs.length; i++) {
         const ref = noterefs[i];
         tippyHover(ref, function() {
-          let href = ref.getAttribute('href');
+          // use id or data attribute instead here
+          let href = ref.getAttribute('data-footnote-href') || ref.getAttribute('href');
           try { href = new URL(href).hash; } catch {}
           const id = href.replace(/^#\/?/, "");
           const note = window.document.getElementById(id);
diff --git a/presentation.qmd b/presentation.qmd
index 68aceb0..25af732 100644
--- a/presentation.qmd
+++ b/presentation.qmd
@@ -102,7 +102,7 @@ measurement_summary(flipper_length_mm) %>% head(2)
 ```{r}
 measurement_summary<-function(data, var, groupings=c("species", "sex")){
 data %>% 
-  group_by(across(groupings)) %>% 
+  group_by(across(all_of(groupings))) %>% 
   summarise(min = min({{ var }}, na.rm=TRUE),
             median = quantile({{ var }}, 0.5, na.rm=TRUE),
             max = max({{ var }}, na.rm=TRUE))
@@ -179,7 +179,7 @@ usethis::use_r("measurement_summary")
 ```{r, eval=FALSE}
 measurement_summary<-function(data, var, groupings=c("species", "sex")){
   data %>%
-    group_by(across(.env$groupings)) %>%
+    group_by(across(all_of(.env$groupings))) %>%
     summarise(min = min(!!!syms(var), na.rm=TRUE),
                      median = quantile(!!!syms(var), 0.5, na.rm=TRUE),
                      max = max(!!!syms(var), na.rm=TRUE))
@@ -205,7 +205,7 @@ devtools::check()
 ```{r}
 measurement_summary<-function(data, var, groupings=c("species", "sex")){
   data %>%
-    dplyr::group_by(dplyr::across(groupings)) %>%
+    dplyr::group_by(dplyr::across(all_of(groupings))) %>%
     dplyr::summarise(min = min({{ var }}, na.rm=TRUE),
                      median = stats::quantile({{ var }}, 0.5, na.rm=TRUE),
                      max = max({{ var }}, na.rm=TRUE))
@@ -217,7 +217,7 @@ measurement_summary<-function(data, var, groupings=c("species", "sex")){
 ```{r, eval=FALSE}
 measurement_summary<-function(data, var, groupings=c("species", "sex")){
   data %>%
-    dplyr::group_by(dplyr::across(.env$groupings)) %>%
+    dplyr::group_by(dplyr::across(all_of(.env$groupings))) %>%
     dplyr::summarise(min = min({{ var }}, na.rm=TRUE),
                      median = stats::quantile({{ var }}, 0.5, na.rm=TRUE),
                      max = max({{ var }}, na.rm=TRUE))
@@ -308,7 +308,7 @@ measurement_summary<-function(data, var, groupings=c("species", "sex")){
   checkmate::reportAssertions(collection = errorMessage)
 
   data %>%
-    dplyr::group_by(dplyr::across(.env$groupings)) %>%
+    dplyr::group_by(dplyr::across(all_of(.env$groupings))) %>%
     dplyr::summarise(min = min(!!!rlang::syms(var), na.rm=TRUE),
                      median = stats::quantile(!!!rlang::syms(var), 0.5, na.rm=TRUE),
                      max = max(!!!rlang::syms(var), na.rm=TRUE))
@@ -331,6 +331,12 @@ usethis::use_package("checkmate")
 usethis::use_package("glue")
 ```
 
+### Insert a Roxygen skeleton, there is two options:
+
+### 1) Place your cursor anywhere in the function you want to document and click Code Tools -\> Insert Roxygen Skeleton
+
+### 2) Place your cursor anywhere in the function you want to document and use the keyboard shortcut Ctrl+Shift+Alt+R
+
 <br/>
 
 . . .
@@ -373,13 +379,19 @@ measurement_summary<-function(data, var, groupings=c("species", "sex")){
   checkmate::reportAssertions(collection = errorMessage)
 
   data %>%
-    dplyr::group_by(dplyr::across(.env$groupings)) %>%
+    dplyr::group_by(dplyr::across(all_of(.env$groupings))) %>%
     dplyr::summarise(min = min(!!!rlang::syms(var), na.rm=TRUE),
                      median = stats::quantile(!!!rlang::syms(var), 0.5, na.rm=TRUE),
                      max = max(!!!rlang::syms(var), na.rm=TRUE))
 }
 ```
 
+## To update the documentation and export the function
+
+```{r, eval=FALSE}
+devtools::check_man()
+```
+
 ## Testing
 
 ```{r, eval=FALSE}
diff --git a/presentation_files/libs/revealjs/dist/theme/quarto.css b/presentation_files/libs/revealjs/dist/theme/quarto.css
index 3e0c594..0a20a95 100644
--- a/presentation_files/libs/revealjs/dist/theme/quarto.css
+++ b/presentation_files/libs/revealjs/dist/theme/quarto.css
@@ -1,5 +1,5 @@
-@import"https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@100;200;300;400;500;600;700;800;900&display=swap";@import"https://fonts.googleapis.com/css?family=News+Cycle:400,700";@import"https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic";@import"./fonts/source-sans-pro/source-sans-pro.css";:root{--r-background-color: #ECEDEB;--r-main-font: Roboto Slab, serif;--r-main-font-size: 40px;--r-main-color: #3A251C;--r-block-margin: 12px;--r-heading-margin: 0 0 12px 0;--r-heading-font: News Cycle, sans-serif;--r-heading-color: #3A251C;--r-heading-line-height: 1.2;--r-heading-letter-spacing: normal;--r-heading-text-transform: none;--r-heading-text-shadow: none;--r-heading-font-weight: 600;--r-heading1-text-shadow: none;--r-heading1-size: 2.5em;--r-heading2-size: 1.6em;--r-heading3-size: 1.3em;--r-heading4-size: 1em;--r-code-font: SFMono-Regular, Menlo, Monaco, Consolas, Liberation Mono, Courier New, monospace;--r-link-color: #39663F;--r-link-color-dark: #1e3521;--r-link-color-hover: #4b8753;--r-selection-background-color: rgba(0, 0, 0, 0.99);--r-selection-color: #ECEDEB}.reveal-viewport{background:#ecedeb;background-color:var(--r-background-color)}.reveal{font-family:var(--r-main-font);font-size:var(--r-main-font-size);font-weight:normal;color:var(--r-main-color)}.reveal ::selection{color:var(--r-selection-color);background:var(--r-selection-background-color);text-shadow:none}.reveal ::-moz-selection{color:var(--r-selection-color);background:var(--r-selection-background-color);text-shadow:none}.reveal .slides section,.reveal .slides section>section{line-height:1.3;font-weight:inherit}.reveal h1,.reveal h2,.reveal h3,.reveal h4,.reveal h5,.reveal h6{margin:var(--r-heading-margin);color:var(--r-heading-color);font-family:var(--r-heading-font);font-weight:var(--r-heading-font-weight);line-height:var(--r-heading-line-height);letter-spacing:var(--r-heading-letter-spacing);text-transform:var(--r-heading-text-transform);text-shadow:var(--r-heading-text-shadow);word-wrap:break-word}.reveal h1{font-size:var(--r-heading1-size)}.reveal h2{font-size:var(--r-heading2-size)}.reveal h3{font-size:var(--r-heading3-size)}.reveal h4{font-size:var(--r-heading4-size)}.reveal h1{text-shadow:var(--r-heading1-text-shadow)}.reveal p{margin:var(--r-block-margin) 0;line-height:1.3}.reveal h1:last-child,.reveal h2:last-child,.reveal h3:last-child,.reveal h4:last-child,.reveal h5:last-child,.reveal h6:last-child{margin-bottom:0}.reveal img,.reveal video,.reveal iframe{max-width:95%;max-height:95%}.reveal strong,.reveal b{font-weight:bold}.reveal em{font-style:italic}.reveal ol,.reveal dl,.reveal ul{display:inline-block;text-align:left;margin:0 0 0 1em}.reveal ol{list-style-type:decimal}.reveal ul{list-style-type:disc}.reveal ul ul{list-style-type:square}.reveal ul ul ul{list-style-type:circle}.reveal ul ul,.reveal ul ol,.reveal ol ol,.reveal ol ul{display:block;margin-left:40px}.reveal dt{font-weight:bold}.reveal dd{margin-left:40px}.reveal blockquote{display:block;position:relative;width:70%;margin:var(--r-block-margin) auto;padding:5px;font-style:italic;background:rgba(255,255,255,.05);box-shadow:0px 0px 2px rgba(0,0,0,.2)}.reveal blockquote p:first-child,.reveal blockquote p:last-child{display:inline-block}.reveal q{font-style:italic}.reveal pre{display:block;position:relative;width:90%;margin:var(--r-block-margin) auto;text-align:left;font-size:.55em;font-family:var(--r-code-font);line-height:1.2em;word-wrap:break-word;box-shadow:0px 5px 15px rgba(0,0,0,.15)}.reveal code{font-family:var(--r-code-font);text-transform:none;tab-size:2}.reveal pre code{display:block;padding:5px;overflow:auto;max-height:400px;word-wrap:normal}.reveal .code-wrapper{white-space:normal}.reveal .code-wrapper code{white-space:pre}.reveal table{margin:auto;border-collapse:collapse;border-spacing:0}.reveal table th{font-weight:bold}.reveal table th,.reveal table td{text-align:left;padding:.2em .5em .2em .5em;border-bottom:1px solid}.reveal table th[align=center],.reveal table td[align=center]{text-align:center}.reveal table th[align=right],.reveal table td[align=right]{text-align:right}.reveal table tbody tr:last-child th,.reveal table tbody tr:last-child td{border-bottom:none}.reveal sup{vertical-align:super;font-size:smaller}.reveal sub{vertical-align:sub;font-size:smaller}.reveal small{display:inline-block;font-size:.6em;line-height:1.2em;vertical-align:top}.reveal small *{vertical-align:top}.reveal img{margin:var(--r-block-margin) 0}.reveal a{color:var(--r-link-color);text-decoration:none;transition:color .15s ease}.reveal a:hover{color:var(--r-link-color-hover);text-shadow:none;border:none}.reveal .roll span:after{color:#fff;background:var(--r-link-color-dark)}.reveal .r-frame{border:4px solid var(--r-main-color);box-shadow:0 0 10px rgba(0,0,0,.15)}.reveal a .r-frame{transition:all .15s linear}.reveal a:hover .r-frame{border-color:var(--r-link-color);box-shadow:0 0 20px rgba(0,0,0,.55)}.reveal .controls{color:var(--r-link-color)}.reveal .progress{background:rgba(0,0,0,.2);color:var(--r-link-color)}@media print{.backgrounds{background-color:var(--r-background-color)}}.top-right{position:absolute;top:1em;right:1em}.hidden{display:none !important}.quarto-layout-panel{margin-bottom:1em}.quarto-layout-panel>figure{width:100%}.quarto-layout-panel>figure>figcaption,.quarto-layout-panel>.panel-caption{margin-top:10pt}.quarto-layout-panel>.table-caption{margin-top:0px}.table-caption p{margin-bottom:.5em}.quarto-layout-row{display:flex;flex-direction:row;align-items:flex-start}.quarto-layout-valign-top{align-items:flex-start}.quarto-layout-valign-bottom{align-items:flex-end}.quarto-layout-valign-center{align-items:center}.quarto-layout-cell{position:relative;margin-right:20px}.quarto-layout-cell:last-child{margin-right:0}.quarto-layout-cell figure,.quarto-layout-cell>p{margin:.2em}.quarto-layout-cell img{max-width:100%}.quarto-layout-cell .html-widget{width:100% !important}.quarto-layout-cell div figure p{margin:0}.quarto-layout-cell figure{display:inline-block;margin-inline-start:0;margin-inline-end:0}.quarto-layout-cell table{display:inline-table}.quarto-layout-cell-subref figcaption,figure .quarto-layout-row figure figcaption{text-align:center;font-style:italic}.quarto-figure{position:relative;margin-bottom:1em}.quarto-figure>figure{width:100%;margin-bottom:0}.quarto-figure-left>figure>p{text-align:left}.quarto-figure-center>figure>p{text-align:center}.quarto-figure-right>figure>p{text-align:right}figure>p:empty{display:none}figure>p:first-child{margin-top:0;margin-bottom:0}figure>figcaption{margin-top:.5em}div[id^=tbl-]{position:relative}.quarto-figure>.anchorjs-link,div[id^=tbl-]>.anchorjs-link{position:absolute;top:0;right:0}.quarto-figure:hover>.anchorjs-link,div[id^=tbl-]:hover>.anchorjs-link,h2:hover>.anchorjs-link,h3:hover>.anchorjs-link,h4:hover>.anchorjs-link,h5:hover>.anchorjs-link,h6:hover>.anchorjs-link,.reveal-anchorjs-link>.anchorjs-link{opacity:1}#title-block-header{margin-block-end:1rem;position:relative;margin-top:-1px}#title-block-header .abstract{margin-block-start:1rem}#title-block-header .abstract .abstract-title{font-weight:600}#title-block-header a{text-decoration:none}#title-block-header .author,#title-block-header .date,#title-block-header .doi{margin-block-end:.2rem}#title-block-header .quarto-title-block>div{display:flex}#title-block-header .quarto-title-block>div>h1{flex-grow:1}#title-block-header .quarto-title-block>div>button{flex-shrink:0;height:2.25rem;margin-top:0}tr.header>th>p:last-of-type{margin-bottom:0px}table,.table{caption-side:top;margin-bottom:1.5rem}caption,.table-caption{text-align:center}.utterances{max-width:none;margin-left:-8px}iframe{margin-bottom:1em}details{margin-bottom:1em}details[show]{margin-bottom:0}details>summary{color:#a1674e}details>summary>p:only-child{display:inline}pre.sourceCode,code.sourceCode{position:relative}code{white-space:pre}@media print{code{white-space:pre-wrap}}pre>code{display:block}pre>code.sourceCode{white-space:pre}pre>code.sourceCode>span>a:first-child::before{text-decoration:none}pre.code-overflow-wrap>code.sourceCode{white-space:pre-wrap}pre.code-overflow-scroll>code.sourceCode{white-space:pre}code a:any-link{color:inherit;text-decoration:none}code a:hover{color:inherit;text-decoration:underline}ul.task-list{padding-left:1em}[data-tippy-root]{display:inline-block}.tippy-content .footnote-back{display:none}.quarto-embedded-source-code{display:none}.quarto-unresolved-ref{font-weight:600}.quarto-cover-image{max-width:35%;float:right;margin-left:30px}.cell-output-display .widget-subarea{margin-bottom:1em}.cell-output-display:not(.no-overflow-x){overflow-x:auto}.panel-input{margin-bottom:1em}.panel-input>div,.panel-input>div>div{display:inline-block;vertical-align:top;padding-right:12px}.panel-input>p:last-child{margin-bottom:0}.layout-sidebar{margin-bottom:1em}.layout-sidebar 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