diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/README.md b/lib/node_modules/@stdlib/stats/incr/nanmgmean/README.md
new file mode 100644
index 000000000000..b3dc1f305cb4
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/README.md
@@ -0,0 +1,178 @@
+
+
+# incrnanmgmean
+
+> Compute a moving [geometric mean][geometric-mean] incrementally, ignoring `NaN` value .
+
+
+
+The [geometric mean][geometric-mean] is defined as the nth root of a product of _n_ numbers.
+
+
+
+```math
+\biggl( \prod_{i=0}^{n-1} \biggr)^{\frac{1}{n}} = \sqrt[n]{x_0 x_1 \cdots x_{n-1}}
+```
+
+
+
+
+
+
+
+
+
+
+
+## Usage
+
+```javascript
+var incrnanmgmean = require( '@stdlib/stats/incr/nanmgmean' );
+```
+
+#### incrnanmgmean( window )
+
+Returns an accumulator `function` which incrementally computes a moving [geometric mean][geometric-mean]. The `window` parameter defines the number of values over which to compute the moving [geometric mean][geometric-mean].
+
+```javascript
+var accumulator = incrnanmgmean( 3 );
+```
+
+#### accumulator( \[x] )
+
+If provided an input value `x`, the accumulator function returns an updated [geometric mean][geometric-mean]. If not provided an input value `x`, the accumulator function returns the current [geometric-mean][geometric-mean].
+
+```javascript
+var accumulator = incrnanmgmean( 3 );
+
+var v = accumulator();
+// returns null
+
+// Fill the window...
+v = accumulator( 2.0 ); // [2.0]
+// returns 2.0
+
+v = accumulator( 1.0 ); // [2.0, 1.0]
+// returns ~1.41
+
+v = accumulator( 3.0 ); // [2.0, 1.0, 3.0]
+// returns ~1.82
+
+v = accumulator( NaN ); // [2.0, 1.0, 3.0]
+// returns ~1.82
+
+// Window begins sliding...
+v = accumulator( 7.0 ); // [1.0, 3.0, 7.0]
+// returns ~2.76
+
+v = accumulator( 5.0 ); // [3.0, 7.0, 5.0]
+// returns ~4.72
+
+v = accumulator();
+// returns ~4.72
+```
+
+
+
+
+
+
+
+## Notes
+
+- Input values are **not** type checked. If a NaN value is provided, the accumulator skips the update and continues to return the previous state. If non-numeric inputs are possible, you are advised to type check and handle accordingly **before** passing the value to the accumulator function.
+- As `W` values are needed to fill the window buffer, the first `W-1` returned values are calculated from smaller sample sizes. Until the window is full, each returned value is calculated from all provided values.
+
+
+
+
+
+
+
+## Examples
+
+
+
+```javascript
+var randu = require( '@stdlib/random/base/randu' );
+var incrnanmgmean = require( '@stdlib/stats/incr/nanmgmean' );
+
+var accumulator;
+var v;
+var i;
+
+// Initialize an accumulator:
+accumulator = incrnanmgmean( 5 );
+
+// For each simulated datum, update the moving geometric mean...
+for ( i = 0; i < 100; i++ ) {
+ if ( randu() < 0.2 ) {
+ v = NaN;
+ } else {
+ v = randu() * 100.0;
+ }
+ accumulator( v );
+}
+console.log( accumulator() );
+```
+
+
+
+
+
+
+
+
+
+* * *
+
+## See Also
+
+- [`@stdlib/stats/incr/gmean`][@stdlib/stats/incr/gmean]: compute a geometric mean incrementally.
+- [`@stdlib/stats/incr/mhmean`][@stdlib/stats/incr/mhmean]: compute a moving harmonic mean incrementally.
+- [`@stdlib/stats/incr/mmean`][@stdlib/stats/incr/mmean]: compute a moving arithmetic mean incrementally.
+
+
+
+
+
+
+
+
+
+[geometric-mean]: https://en.wikipedia.org/wiki/Geometric_mean
+
+
+
+[@stdlib/stats/incr/gmean]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/gmean
+
+[@stdlib/stats/incr/mhmean]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mhmean
+
+[@stdlib/stats/incr/mmean]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mmean
+
+
+
+
+
+
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/incr/nanmgmean/benchmark/benchmark.js
new file mode 100644
index 000000000000..6e5817a518af
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/benchmark/benchmark.js
@@ -0,0 +1,69 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/base/randu' );
+var pkg = require( './../package.json' ).name;
+var incrnanmgmean = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+ var f;
+ var i;
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ f = incrnanmgmean( ( i%5 )+1 );
+ if ( typeof f !== 'function' ) {
+ b.fail( 'should return a function' );
+ }
+ }
+ b.toc();
+ if ( typeof f !== 'function' ) {
+ b.fail( 'should return a function' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
+
+bench( pkg+'::accumulator', function benchmark( b ) {
+ var acc;
+ var v;
+ var i;
+
+ acc = incrnanmgmean( 5 );
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ v = acc( randu() );
+ if ( v !== v ) {
+ b.fail( 'should not return NaN' );
+ }
+ }
+ b.toc();
+ if ( v !== v ) {
+ b.fail( 'should not return NaN' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/img/equation_geometric_mean.svg b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/img/equation_geometric_mean.svg
new file mode 100644
index 000000000000..09660f01bb97
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/img/equation_geometric_mean.svg
@@ -0,0 +1,68 @@
+
\ No newline at end of file
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/repl.txt b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/repl.txt
new file mode 100644
index 000000000000..074fa5005e80
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/repl.txt
@@ -0,0 +1,43 @@
+
+{{alias}}( W )
+ Returns an accumulator function which incrementally computes a moving
+ geometric mean, ignoring `NaN` value.
+
+ The `W` parameter defines the number of values over which to compute the
+ moving geometric mean.
+
+ If provided a value, the accumulator function returns an updated moving
+ geometric mean. If not provided a value, the accumulator function returns
+ the current moving geometric mean.
+
+ Parameters
+ ----------
+ W: integer
+ Window size.
+
+ Returns
+ -------
+ acc: Function
+ Accumulator function.
+
+ Examples
+ --------
+ > var accumulator = {{alias}}( 3 );
+ > var v = accumulator()
+ null
+ > v = accumulator( 2.0 )
+ 2.0
+ > v = accumulator( 5.0 )
+ ~3.16
+ > v = accumulator( 3.0 )
+ ~3.11
+ > v = accumulator( NaN )
+ ~3.11
+ > v = accumulator( 5.0 )
+ ~4.22
+ > v = accumulator()
+ ~4.22
+
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/types/index.d.ts b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/types/index.d.ts
new file mode 100644
index 000000000000..6e07bc6241a9
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/types/index.d.ts
@@ -0,0 +1,72 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+///
+
+/**
+* If provided a value, returns an updated geometric mean; otherwise, returns the current geometric mean.
+*
+* @param x - value
+* @returns geometric mean
+*/
+type accumulator = ( x?: number ) => number | null;
+
+/**
+* Returns an accumulator function which incrementally computes a moving geometric mean, ignoring `NaN` value.
+*
+* ## Notes
+*
+* - The `W` parameter defines the number of values over which to compute the moving geometric mean.
+* - As `W` values are needed to fill the window buffer, the first `W-1` returned values are calculated from smaller sample sizes. Until the window is full, each returned value is calculated from all provided values.
+*
+* @param W - window size
+* @throws must provide a positive integer
+* @returns accumulator function
+*
+* @example
+* var accumulator = incrnanmgmean( 3 );
+*
+* var v = accumulator();
+* // returns null
+*
+* v = accumulator( 2.0 );
+* // returns 2.0
+*
+* v = accumulator( 5.0 );
+* // returns ~3.16
+*
+* v = accumulator( 3.0 );
+* // returns ~3.11
+*
+* v = accumulator( NaN );
+* // returns ~3.11
+*
+* v = accumulator( 5.0 );
+* // returns ~4.22
+*
+* v = accumulator();
+* // returns ~4.22
+*/
+declare function incrnanmgmean( W: number ): accumulator;
+
+
+// EXPORTS //
+
+export = incrnanmgmean;
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/types/test.ts b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/types/test.ts
new file mode 100644
index 000000000000..8899f0f49192
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/docs/types/test.ts
@@ -0,0 +1,66 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import incrnanmgmean = require( './index' );
+
+
+// TESTS //
+
+// The function returns an accumulator function...
+{
+ incrnanmgmean( 3 ); // $ExpectType accumulator
+}
+
+// The compiler throws an error if the function is provided an argument that is not a number...
+{
+ incrnanmgmean( '5' ); // $ExpectError
+ incrnanmgmean( true ); // $ExpectError
+ incrnanmgmean( false ); // $ExpectError
+ incrnanmgmean( null ); // $ExpectError
+ incrnanmgmean( undefined ); // $ExpectError
+ incrnanmgmean( [] ); // $ExpectError
+ incrnanmgmean( {} ); // $ExpectError
+ incrnanmgmean( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an invalid number of arguments...
+{
+ incrnanmgmean(); // $ExpectError
+ incrnanmgmean( 5, 3 ); // $ExpectError
+}
+
+// The function returns an accumulator function which returns an accumulated result...
+{
+ const acc = incrnanmgmean( 3 );
+
+ acc(); // $ExpectType number | null
+ acc( 3.14 ); // $ExpectType number | null
+}
+
+// The compiler throws an error if the returned accumulator function is provided invalid arguments...
+{
+ const acc = incrnanmgmean( 3 );
+
+ acc( '5' ); // $ExpectError
+ acc( true ); // $ExpectError
+ acc( false ); // $ExpectError
+ acc( null ); // $ExpectError
+ acc( [] ); // $ExpectError
+ acc( {} ); // $ExpectError
+ acc( ( x: number ): number => x ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/examples/index.js b/lib/node_modules/@stdlib/stats/incr/nanmgmean/examples/index.js
new file mode 100644
index 000000000000..5951d6282515
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/examples/index.js
@@ -0,0 +1,42 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var randu = require( '@stdlib/random/base/randu' );
+var incrnanmgmean = require( './../lib' );
+
+var accumulator;
+var m;
+var v;
+var i;
+
+// Initialize an accumulator:
+accumulator = incrnanmgmean( 5 );
+
+// For each simulated datum, update the moving geometric mean...
+console.log( '\nValue\tGeometric Mean\n' );
+for ( i = 0; i < 100; i++ ) {
+ if ( randu() < 0.1 ) {
+ v = NaN;
+ } else {
+ v = randu() * 100.0;
+ }
+ m = accumulator( v );
+ console.log( '%d\t%d', v.toFixed( 4 ), m.toFixed( 4 ) );
+}
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/lib/index.js b/lib/node_modules/@stdlib/stats/incr/nanmgmean/lib/index.js
new file mode 100644
index 000000000000..1edc278cc890
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/lib/index.js
@@ -0,0 +1,60 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Compute a moving geometric mean incrementally, ignoring `NaN` value.
+*
+* @module @stdlib/stats/incr/nanmgmean
+*
+* @example
+* var incrnanmgmean = require( '@stdlib/stats/incr/nanmgmean' );
+*
+* var accumulator = incrnanmgmean( 3 );
+*
+* var v = accumulator();
+* // returns null
+*
+* v = accumulator( 2.0 );
+* // returns 2.0
+*
+* v = accumulator( 5.0 );
+* // returns ~3.16
+*
+* v = accumulator( 3.0 );
+* // returns ~3.11
+*
+* v = accumulator( NaN );
+* // returns ~3.11
+*
+* v = accumulator( 5.0 );
+* // returns ~4.22
+*
+* v = accumulator();
+* // returns ~4.22
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/lib/main.js b/lib/node_modules/@stdlib/stats/incr/nanmgmean/lib/main.js
new file mode 100644
index 000000000000..0f98c6b7d863
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/lib/main.js
@@ -0,0 +1,83 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var incrmgmean = require( '@stdlib/stats/incr/mgmean' );
+
+
+// MAIN //
+
+/**
+* Returns an accumulator function which incrementally computes a moving geometric mean, ignoring `NaN` value.
+*
+* @param {PositiveInteger} W - window size
+* @throws {TypeError} must provide a positive integer
+* @returns {Function} accumulator function
+*
+* @example
+* var accumulator = incrnanmgmean( 3 );
+*
+* var v = accumulator();
+* // returns null
+*
+* v = accumulator( 2.0 );
+* // returns 2.0
+*
+* v = accumulator( 5.0 );
+* // returns ~3.16
+*
+* v = accumulator( 3.0 );
+* // returns ~3.11
+*
+* v = accumulator( NaN );
+* // returns ~3.11
+*
+* v = accumulator( 5.0 );
+* // returns ~4.22
+*
+* v = accumulator();
+* // returns ~4.22
+*/
+function incrnanmgmean( W ) {
+ var acc = incrmgmean( W );
+ return accumulator;
+
+ /**
+ * If provided a value, the accumulator function returns an updated geometric mean. If not provided a value, the accumulator function returns the current geometric mean.
+ *
+ * @private
+ * @param {number} [x] - input value
+ * @returns {(number|null)} geometric mean or null
+ */
+ function accumulator( x ) {
+ if ( arguments.length === 0 || isnan( x ) || !isNumber( x ) ) {
+ return acc();
+ }
+ return acc( x );
+ }
+}
+
+
+// EXPORTS //
+
+module.exports = incrnanmgmean;
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/package.json b/lib/node_modules/@stdlib/stats/incr/nanmgmean/package.json
new file mode 100644
index 000000000000..20785c0c5066
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/package.json
@@ -0,0 +1,75 @@
+{
+ "name": "@stdlib/stats/incr/nanmgmean",
+ "version": "0.0.0",
+ "description": "Compute a moving geometric mean incrementally, ignoring `NaN` value.",
+ "license": "Apache-2.0",
+ "author": {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ },
+ "contributors": [
+ {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ }
+ ],
+ "main": "./lib",
+ "directories": {
+ "benchmark": "./benchmark",
+ "doc": "./docs",
+ "example": "./examples",
+ "lib": "./lib",
+ "test": "./test"
+ },
+ "types": "./docs/types",
+ "scripts": {},
+ "homepage": "https://github.com/stdlib-js/stdlib",
+ "repository": {
+ "type": "git",
+ "url": "git://github.com/stdlib-js/stdlib.git"
+ },
+ "bugs": {
+ "url": "https://github.com/stdlib-js/stdlib/issues"
+ },
+ "dependencies": {},
+ "devDependencies": {},
+ "engines": {
+ "node": ">=0.10.0",
+ "npm": ">2.7.0"
+ },
+ "os": [
+ "aix",
+ "darwin",
+ "freebsd",
+ "linux",
+ "macos",
+ "openbsd",
+ "sunos",
+ "win32",
+ "windows"
+ ],
+ "keywords": [
+ "stdlib",
+ "stdmath",
+ "statistics",
+ "stats",
+ "mathematics",
+ "math",
+ "average",
+ "avg",
+ "geometric",
+ "mean",
+ "geometric mean",
+ "product",
+ "prod",
+ "central tendency",
+ "incremental",
+ "accumulator",
+ "moving mean",
+ "moving average",
+ "sliding window",
+ "sliding",
+ "window",
+ "moving"
+ ]
+}
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmgmean/test/test.js b/lib/node_modules/@stdlib/stats/incr/nanmgmean/test/test.js
new file mode 100644
index 000000000000..35b6a4d57f21
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmgmean/test/test.js
@@ -0,0 +1,140 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var abs = require( '@stdlib/math/base/special/abs' );
+var EPSILON = require( '@stdlib/constants/float64/eps' );
+var incrnanmgmean = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof incrnanmgmean, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function throws an error if not provided a positive integer', function test( t ) {
+ var values;
+ var i;
+
+ values = [
+ '5',
+ -5.0,
+ 0.0,
+ 3.14,
+ true,
+ null,
+ void 0,
+ NaN,
+ [],
+ {},
+ function noop() {}
+ ];
+
+ for ( i = 0; i < values.length; i++ ) {
+ t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );
+ }
+ t.end();
+
+ function badValue( value ) {
+ return function badValue() {
+ incrnanmgmean( value );
+ };
+ }
+});
+
+tape( 'the function returns an accumulator function', function test( t ) {
+ t.equal( typeof incrnanmgmean( 3 ), 'function', 'returns a function' );
+ t.end();
+});
+
+tape( 'the accumulator function computes a moving geometric mean incrementally', function test( t ) {
+ var expected;
+ var actual;
+ var delta;
+ var data;
+ var tol;
+ var acc;
+ var N;
+ var i;
+
+ data = [ 2.0, 3.0, NaN, 2.0, 4.0, 3.0, 4.0 ];
+ N = data.length;
+
+ acc = incrnanmgmean( 3 );
+
+ actual = [];
+ for ( i = 0; i < N; i++ ) {
+ actual.push( acc( data[ i ] ) );
+ }
+ // Note: computed by hand using textbook formula:
+ expected = [
+ 2.0,
+ 2.449489742783178,
+ 2.449489742783178,
+ 2.2894284851066637,
+ 2.8844991406148166,
+ 2.8844991406148166,
+ 3.634241185664279
+ ];
+
+ for ( i = 0; i < N; i++ ) {
+ if ( actual[ i ] === expected[ i ] ) {
+ t.equal( actual[ i ], expected[ i ], 'returns expected value' );
+ } else {
+ delta = abs( expected[ i ] - actual[ i ] );
+ tol = 1.2 * EPSILON * abs( expected[ i ] );
+ t.equal( delta <= tol, true, 'within tolerance. Expected: '+expected[ i ]+'. Actual: '+actual[ i ]+'. Delta: '+delta+'. Tol: '+tol+'.' );
+ }
+ }
+ t.end();
+});
+
+tape( 'if not provided an input value, the accumulator function returns the current geometric mean', function test( t ) {
+ var expected;
+ var actual;
+ var delta;
+ var data;
+ var acc;
+ var tol;
+ var i;
+
+ data = [ 2.0, NaN, 3.0, 5.0 ];
+ acc = incrnanmgmean( 2 );
+ for ( i = 0; i < data.length; i++ ) {
+ acc( data[ i ] );
+ }
+ actual = acc();
+ expected = 3.872983346207417; // Note: computed by hand using textbook formula
+ delta = abs( expected - actual );
+ tol = 1.0 * EPSILON * abs( expected );
+ t.equal( delta <= tol, true, 'within tolerance. Expected: '+expected+'. Actual: '+actual+'. Delta: '+delta+'. Tol: '+tol+'.' );
+ t.end();
+});
+
+tape( 'if data has yet to be provided, the accumulator function returns `null`', function test( t ) {
+ var acc = incrnanmgmean( 3 );
+ t.equal( acc(), null, 'returns null' );
+ t.end();
+});