feat: add stats/incr/nanmmeanvar

[anoofmhd]

Resolves #5592.

Description

What is the purpose of this pull request?

This pull request:

• Adds a new incremental moving mean and variance accumulator: @stdlib/stats/incr/nanmmeanvar.

• This module behaves similarly to @stdlib/stats/incr/mmeanvar, but skips NaN values instead of propagating them.

• Includes implementation, tests, documentation, TypeScript definitions, REPL help file, benchmarks, and examples.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: add stats/incr/nanmmeanvar #5592

Questions

Any questions for reviewers of this pull request?

No.

Other

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No additional information.

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Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

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• Test/benchmark generation
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I used ChatGPT to assist in understanding spec expectations and drafting documentation wording.
The implementation and test logic were written and verified manually.

---

@stdlib-js/reviewers

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/incr/nanmmeanvar	$\\color{green}143/143$ $\\color{green}+0.00\\%$	$\\color{green}10/10$ $\\color{green}+0.00\\%$	$\\color{green}2/2$ $\\color{green}+0.00\\%$	$\\color{green}143/143$ $\\color{green}+0.00\\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

/stdlib update-copyright-years

[anoofmhd]

@Planeshifter @stdlib-bot @kgryte @rotu can you please review it and tell me if any changes needed or the PR is ready to merge.

[anoofmhd]

@kgryte Can you please review it and suggest me any changes needed.

[Planeshifter]

Should be ready to go.

[stdlib-bot]

PR Commit Message

feat: add `stats/incr/nanmmeanvar`

PR-URL: https://github.com/stdlib-js/stdlib/pull/8502
Closes: https://github.com/stdlib-js/stdlib/issues/5592

Co-authored-by: Athan Reines <kgryte@gmail.com>
Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com>
Co-authored-by: stdlib-bot <noreply@stdlib.io>
Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>
Reviewed-by: Athan Reines <kgryte@gmail.com>
Signed-off-by: Anoof Mohammed KP <anoofmhd48@gmail.com>

Please review the above commit message and make any necessary adjustments.