feat: add stats/base/dists/halfnormal/stdev

[bhargava-d16]

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Progresses #9416

Description

What is the purpose of this pull request?

This pull request:

• This PR adds implementation of standard deviation calculation for half-normal distribution.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Tracking issue for complete implementation of @stdlib/stats/base/dists/halfnormal package #9416

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

Checklist

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?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

I consulted ChatGPT to verify mathematical formulation of half-normal standard deviation function and to confirm expected numerical values

---

@stdlib-js/reviewers

[Planeshifter]

Thanks!

[Planeshifter]

The README example uses 0.1 as the minimum value, but this file uses 0.0. To keep consistency with the README,

Suggested change

	var sigma = uniform( 10, 0.0, 20.0, opts );
	var sigma = uniform( 10, 0.1, 20.0, opts );

[Planeshifter]

This file has two trailing newlines. Per stdlib style, files should end with exactly one trailing newline.

[Planeshifter]

This file has two trailing newlines. Per stdlib style, files should end with exactly one trailing newline.

[Planeshifter]

This file has two trailing newlines. Per stdlib style, files should end with exactly one trailing newline.

[Planeshifter]

See also failing check runs.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/halfnormal/stdev	$\color{green}168/168$ $\color{green}+0.00%$	$\color{green}8/8$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}168/168$ $\color{green}+0.00%$

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

[Planeshifter]

Let's get it in! 🚀

[stdlib-bot]

PR Commit Message

feat: add `stats/base/dists/halfnormal/stdev`

PR-URL: https://github.com/stdlib-js/stdlib/pull/9714
Ref: https://github.com/stdlib-js/stdlib/issues/9416

Co-authored-by: Philipp Burckhardt <[email protected]>
Reviewed-by: Philipp Burckhardt <[email protected]>
Signed-off-by: Philipp Burckhardt <[email protected]>

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