diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/README.md b/lib/node_modules/@stdlib/stats/incr/nanmidrange/README.md
new file mode 100644
index 000000000000..d9393a29f81c
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/README.md
@@ -0,0 +1,161 @@
+<!--
+
+@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.
+
+-->
+
+# incrnanmidrange
+
+> Compute a [mid-range][mid-range] incrementally, ignoring `NaN` values.
+
+<section class="intro">
+
+The [**mid-range**][mid-range], or **mid-extreme**, is the arithmetic mean of maximum and minimum values. Accordingly, the [mid-range][mid-range] is the midpoint of the [range][range] and a measure of central tendency.
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var incrnanmidrange = require( '@stdlib/stats/incr/nanmidrange' );
+```
+
+#### incrnanmidrange()
+
+Returns an accumulator `function` which incrementally computes a [mid-range][mid-range], ignoring `NaN` values.
+
+```javascript
+var accumulator = incrnanmidrange();
+```
+
+#### accumulator( \[x] )
+
+If provided an input value `x`, the accumulator function returns an updated [mid-range][mid-range]. If not provided an input value `x`, the accumulator function returns the current [mid-range][mid-range].
+
+```javascript
+var accumulator = incrnanmidrange();
+
+var midrange = accumulator();
+// returns null
+
+midrange = accumulator( -2.0 );
+// returns -2.0
+
+midrange = accumulator( NaN );
+// returns -2.0
+
+midrange = accumulator( 1.0 );
+// returns -0.5
+
+midrange = accumulator( 3.0 );
+// returns 0.5
+
+midrange = accumulator();
+// returns 0.5
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+- Input values are **not** type checked. If non-numeric inputs are possible, you are advised to type check and handle accordingly **before** passing the value to the accumulator function.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var uniform = require( '@stdlib/random/base/uniform' );
+var bernoulli = require( '@stdlib/random/base/bernoulli' );
+var incrnanmidrange = require( '@stdlib/stats/incr/nanmidrange' );
+
+var accumulator;
+var v;
+var i;
+
+// Initialize an accumulator:
+accumulator = incrnanmidrange();
+
+// For each simulated datum, update the mid-range...
+for ( i = 0; i < 100; i++ ) {
+ v = ( bernoulli( 0.8 ) < 1 ) ? NaN : uniform( 0.0, 100.0 );
+ accumulator( v );
+}
+console.log( accumulator() );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+* * *
+
+## See Also
+
+- <span class="package-name">[`@stdlib/stats/incr/mean`][@stdlib/stats/incr/mean]</span><span class="delimiter">: </span><span class="description">compute an arithmetic mean incrementally.</span>
+- <span class="package-name">[`@stdlib/stats/incr/max`][@stdlib/stats/incr/max]</span><span class="delimiter">: </span><span class="description">compute a maximum value incrementally.</span>
+- <span class="package-name">[`@stdlib/stats/incr/min`][@stdlib/stats/incr/min]</span><span class="delimiter">: </span><span class="description">compute a minimum value incrementally.</span>
+- <span class="package-name">[`@stdlib/stats/incr/range`][@stdlib/stats/incr/range]</span><span class="delimiter">: </span><span class="description">compute a range incrementally.</span>
+- <span class="package-name">[`@stdlib/stats/incr/summary`][@stdlib/stats/incr/summary]</span><span class="delimiter">: </span><span class="description">compute a statistical summary incrementally.</span>
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[range]: https://en.wikipedia.org/wiki/Range_%28statistics%29
+
+[mid-range]: https://en.wikipedia.org/wiki/Mid-range
+
+<!-- <related-links> -->
+
+[@stdlib/stats/incr/mean]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mean
+
+[@stdlib/stats/incr/max]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/max
+
+[@stdlib/stats/incr/min]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/min
+
+[@stdlib/stats/incr/range]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/range
+
+[@stdlib/stats/incr/summary]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/summary
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/incr/nanmidrange/benchmark/benchmark.js
new file mode 100644
index 000000000000..97671f982eb6
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/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 incrnanmidrange = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+ var f;
+ var i;
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ f = incrnanmidrange();
+ 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 = incrnanmidrange();
+
+ 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/nanmidrange/docs/repl.txt b/lib/node_modules/@stdlib/stats/incr/nanmidrange/docs/repl.txt
new file mode 100644
index 000000000000..1e575b964272
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/docs/repl.txt
@@ -0,0 +1,37 @@
+
+{{alias}}()
+ Returns an accumulator function which incrementally computes a mid-range,
+ ignoring `NaN` values.
+
+ The mid-range is the arithmetic mean of maximum and minimum values.
+ Accordingly, the mid-range is the midpoint of the range and a measure of
+ central tendency.
+
+ If provided a value, the accumulator function returns an updated mid-range.
+ If not provided a value, the accumulator function returns the current mid-
+ range.
+
+ Returns
+ -------
+ acc: Function
+ Accumulator function.
+
+ Examples
+ --------
+ > var accumulator = {{alias}}();
+ > var v = accumulator()
+ null
+ > v = accumulator( 3.14 )
+ 3.14
+ > v = accumulator( NaN )
+ 3.14
+ > v = accumulator( -5.0 )
+ ~-0.93
+ > v = accumulator( 10.1 )
+ 2.55
+ > v = accumulator()
+ 2.55
+
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/docs/types/Test.ts b/lib/node_modules/@stdlib/stats/incr/nanmidrange/docs/types/Test.ts
new file mode 100644
index 000000000000..a03167d45fa3
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/docs/types/Test.ts
@@ -0,0 +1,63 @@
+/*
+* @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 incrnanmidrange = require( './index' );
+
+
+// TESTS //
+
+// The function returns an accumulator function...
+{
+ incrnanmidrange(); // $ExpectType accumulator
+}
+
+// The compiler throws an error if the function is provided arguments...
+{
+ incrnanmidrange( '5' ); // $ExpectError
+ incrnanmidrange( 5 ); // $ExpectError
+ incrnanmidrange( true ); // $ExpectError
+ incrnanmidrange( false ); // $ExpectError
+ incrnanmidrange( null ); // $ExpectError
+ incrnanmidrange( undefined ); // $ExpectError
+ incrnanmidrange( [] ); // $ExpectError
+ incrnanmidrange( {} ); // $ExpectError
+ incrnanmidrange( ( x: number ): number => x ); // $ExpectError
+}
+
+// The function returns an accumulator function which returns an accumulated result...
+{
+ const acc = incrnanmidrange();
+
+ acc(); // $ExpectType number | null
+ acc( 3.14 ); // $ExpectType number | null
+ acc( 5 ); // $ExpectType number | null
+ acc( -2 ); // $ExpectType number | null
+}
+
+// The compiler throws an error if the returned accumulator function is provided invalid arguments...
+{
+ const acc = incrnanmidrange();
+
+ 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/nanmidrange/docs/types/index.d.ts b/lib/node_modules/@stdlib/stats/incr/nanmidrange/docs/types/index.d.ts
new file mode 100644
index 000000000000..71f14eefcc2c
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/docs/types/index.d.ts
@@ -0,0 +1,64 @@
+/*
+* @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
+
+/// <reference types="@stdlib/types"/>
+
+/**
+* If provided a value, returns an updated mid-range; otherwise, returns the current mid-range.
+*
+* ## Notes
+*
+* - The mid-range is the arithmetic mean of maximum and minimum values. Accordingly, the mid-range is the midpoint of the range and a measure of central tendency.
+* - If provided `NaN` or a value which, when used in computations, results in `NaN`, the accumulated value is `NaN` for all future invocations.
+*
+* @param x - value
+* @returns mid-range
+*/
+type accumulator = ( x?: number ) => number | null;
+
+/**
+* Returns an accumulator function which incrementally computes a mid-range, ignoring `NaN` values.
+*
+* @returns accumulator function
+*
+* @example
+* var accumulator = incrnanmidrange();
+*
+* var midrange = accumulator();
+* // returns null
+*
+* midrange = accumulator( 3.14 );
+* // returns 3.14
+*
+* midrange = accumulator( -5.0 );
+* // returns ~-0.93
+*
+* midrange = accumulator( 10.1 );
+* // returns 2.55
+*
+* midrange = accumulator();
+* // returns 2.55
+*/
+declare function incrnanmidrange(): accumulator;
+
+
+// EXPORTS //
+
+export = incrnanmidrange;
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/examples/index.js b/lib/node_modules/@stdlib/stats/incr/nanmidrange/examples/index.js
new file mode 100644
index 000000000000..56a03abd8016
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/examples/index.js
@@ -0,0 +1,45 @@
+/**
+* @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 uniform = require( '@stdlib/random/base/uniform' );
+var bernoulli = require( '@stdlib/random/base/bernoulli' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var incrnanmidrange = require( './../lib' );
+
+var accumulator;
+var midrange;
+var v;
+var i;
+
+// Initialize an accumulator:
+accumulator = incrnanmidrange();
+
+// For each simulated datum, update the mid-range...
+console.log( '\nValue\tMid-range\n' );
+for ( i = 0; i < 100; i++ ) {
+ v = ( bernoulli( 0.8 ) < 1 ) ? NaN : uniform( 0.0, 100.0 );
+ midrange = accumulator( v );
+ if ( midrange === null ) {
+ console.log( '%d\t%s', v.toFixed( 4 ), midrange );
+ } else {
+ console.log( '%d\t%d', ( isnan( v ) ) ? NaN : v.toFixed( 4 ), midrange.toFixed( 4 ) );
+ }
+}
+console.log( '\nFinal mid-range: %d\n', accumulator() );
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/lib/index.js b/lib/node_modules/@stdlib/stats/incr/nanmidrange/lib/index.js
new file mode 100644
index 000000000000..bbeb443d5df0
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/lib/index.js
@@ -0,0 +1,57 @@
+/**
+* @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 mid-range incrementally, ignoring `NaN` values.
+*
+* @module @stdlib/stats/incr/nanmidrange
+*
+* @example
+* var incrnanmidrange = require( '@stdlib/stats/incr/nanmidrange' );
+*
+* var accumulator = incrnanmidrange();
+*
+* var midrange = accumulator();
+* // returns null
+*
+* midrange = accumulator( 3.14 );
+* // returns 3.14
+*
+* midrange = accumulator( NaN );
+* // returns 3.14
+*
+* midrange = accumulator( -5.0 );
+* // returns ~-0.93
+*
+* midrange = accumulator( 10.1 );
+* // returns 2.55
+*
+* midrange = accumulator();
+* // returns 2.55
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/lib/main.js b/lib/node_modules/@stdlib/stats/incr/nanmidrange/lib/main.js
new file mode 100644
index 000000000000..007776633549
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/lib/main.js
@@ -0,0 +1,77 @@
+/**
+* @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 isnan = require( '@stdlib/math/base/assert/is-nan' );
+var incrmidrange = require( '@stdlib/stats/incr/midrange' );
+
+
+// MAIN //
+
+/**
+* Returns an accumulator function which incrementally computes a mid-range, ignoring `NaN` values.
+*
+* @returns {Function} accumulator function
+*
+* @example
+* var accumulator = incrnanmidrange();
+*
+* var midrange = accumulator();
+* // returns null
+*
+* midrange = accumulator( 3.14 );
+* // returns 3.14
+*
+* midrange = accumulator( NaN );
+* // returns 3.14
+*
+* midrange = accumulator( -5.0 );
+* // returns ~-0.93
+*
+* midrange = accumulator( 10.1 );
+* // returns 2.55
+*
+* midrange = accumulator();
+* // returns 2.55
+*/
+function incrnanmidrange() {
+ var midrange = incrmidrange();
+ return accumulator;
+
+ /**
+ * If provided a value, the accumulator function returns an updated mid-range. If not provided a value, the accumulator function returns the current mid-range.
+ *
+ * @private
+ * @param {number} [x] - new value
+ * @returns {number} mid-range
+ */
+ function accumulator( x ) {
+ if ( arguments.length === 0 || isnan( x ) ) {
+ return midrange();
+ }
+ return midrange( x );
+ }
+}
+
+
+// EXPORTS //
+
+module.exports = incrnanmidrange;
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/package.json b/lib/node_modules/@stdlib/stats/incr/nanmidrange/package.json
new file mode 100644
index 000000000000..e087aa31594f
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/package.json
@@ -0,0 +1,71 @@
+{
+ "name": "@stdlib/stats/incr/nanmidrange",
+ "version": "0.0.0",
+ "description": "Compute a mid-range incrementally, ignoring `NaN` values.",
+ "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",
+ "maximum",
+ "max",
+ "minimum",
+ "min",
+ "mid",
+ "range",
+ "mid-range",
+ "mid-extreme",
+ "mean",
+ "central tendency",
+ "incremental",
+ "accumulator"
+ ]
+}
diff --git a/lib/node_modules/@stdlib/stats/incr/nanmidrange/test/test.js b/lib/node_modules/@stdlib/stats/incr/nanmidrange/test/test.js
new file mode 100644
index 000000000000..c0c177de28d9
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nanmidrange/test/test.js
@@ -0,0 +1,108 @@
+/**
+* @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 isnan = require( '@stdlib/math/base/assert/is-nan' );
+var incrnanmidrange = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof incrnanmidrange, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function returns an accumulator function', function test( t ) {
+ t.equal( typeof incrnanmidrange(), 'function', 'returns a function' );
+ t.end();
+});
+
+tape( 'if not provided any values, the initial returned mid-range is `null`', function test( t ) {
+ var acc = incrnanmidrange();
+ t.equal( acc(), null, 'returns null' );
+ t.end();
+});
+
+tape( 'the accumulator function incrementally computes a mid-range', function test( t ) {
+ var expected;
+ var actual;
+ var data;
+ var acc;
+ var max;
+ var min;
+ var N;
+ var d;
+ var i;
+
+ data = [ 2.0, NaN, 3.0, -2.0, NaN, 4.0, -3.0, 4.0 ];
+ N = data.length;
+
+ expected = [];
+ actual = [];
+
+ acc = incrnanmidrange();
+
+ max = null;
+ min = null;
+
+ for ( i = 0; i < N; i++ ) {
+ d = data[ i ];
+
+ if ( !isnan( d ) ) {
+ if ( max === null || d > max ) {
+ max = d;
+ }
+ if ( min === null || d < min ) {
+ min = d;
+ }
+ }
+
+ if ( max !== null && min !== null ) {
+ expected.push( ( max + min ) / 2.0 );
+ } else {
+ expected.push( null );
+ }
+
+ actual.push( acc( d ) );
+ }
+
+ t.deepEqual( actual, expected, 'returns expected incremental results' );
+ t.end();
+});
+
+tape( 'if not provided an input value, the accumulator function returns the current mid-range', function test( t ) {
+ var data;
+ var acc;
+ var i;
+
+ data = [ -2.0, 3.0, NaN, 1.0 ];
+ acc = incrnanmidrange();
+
+ for ( i = 0; i < data.length; i++ ) {
+ acc( data[ i ] );
+ }
+
+ t.equal( acc(), 0.5, 'returns the current accumulated mid-range' );
+ t.end();
+});