small updates to vignette

vignettes/usage.Rmd

@@ -58,21 +58,19 @@ If you do wish to restrict some attribute level combinations, you can do so usin
 
 - `"Gala"` apples will not be shown with the prices `1.5`, `2.5`, and `3.5`.
 - `"Honeycrisp"` apples will not be shown with prices less than `2`.
-- `"Honeycrisp"` apples will only be shown with `"Average"` freshness.
 - `"Fuji"` apples will not be shown with the `"Excellent"` freshness.
 
-With these restrictions, there are now only 39 profiles compared to 81 without them:
+With these restrictions, there are now only 57 profiles compared to 81 without them:
 
 ```{r}
 restricted_profiles <- cbc_restrict(
     profiles,
     type == "Gala" & price %in% c(1.5, 2.5, 3.5),
-    type == "Honeycrisp" & price > 2,
-    type == "Honeycrisp" & freshness %in% c("Poor", "Excellent"),
+    type == "Honeycrisp" & price < 2,
     type == "Fuji" & freshness == "Excellent"
 )
 
-restricted_profiles
+dim(restricted_profiles)
 ```
 
 # Generate survey designs
@@ -85,23 +83,14 @@ Once a set of profiles is obtained, a conjoint survey can then be generated usin
 - `n_q`: The number of questions per respondent.
 - `method`: The design strategy to use (defaults to `"random"`).
 
-The `method` argument determines the design method used. Options are:
+The `method` argument determines the design strategy to use: `"random"`, `"full"`, `"orthogonal"`, `"dopt"`, `"CEA"`, or `"Modfed"`. All methods ensure that the two following criteria are met:
 
-- `"random"`
-- `"full"`
-- `"orthogonal"`
-- `"dopt"`
-- `"CEA"`
-- `"Modfed"`
-
-All methods ensure that the two following criteria are met:
-
-1. No two profiles are the same within any one choice set. 
+1. No two profiles are the same within any one choice set.
 2. No two choice sets are the same within any one respondent.
 
-The table below summarizes method compatibility with other design options, including the ability to include a "no choice" option, the creation of a "labeled" design (also called a "alternative-specific" design), the use of restricted profile, and the use of blocking.
+The table below summarizes method compatibility with other design options, including the ability to include a "no choice" option, the creation of a "labeled" design (also called a "alternative-specific" design), the use of restricted profiles, and the use of blocking.
 
-Method | Include "no choice"? | Labeled designs? | Restricted profiles? | Blocking?
+Method | No choice | Labeled designs | Restricted profiles | Blocking
 ---|---|---|---|---
 `"random"`     | Yes | Yes | Yes | No
 `"full"`       | Yes | Yes | Yes | Yes