[sarthakkaushik927]

Resolves #5562.

Description

What is the purpose of this pull request?

This pull request:

• adds @stdlib/stats/incr/nanmaape, which incrementally computes the mean arctangent absolute percentage error, ignoring NaN values.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: add stats/incr/nanmaape #5562

Reference Packages

Did the content of this pull request follow one or more existing packages? Answering is optional.

This pull request followed these packages:

• stats/incr/maape
• stats/incr/nanmape

What carried over from the reference(s)?

• package structure, documentation, examples, benchmarks, and tests from stats/incr/maape
• the thin NaN-skipping wrapper pattern (and the approach to testing NaN handling) from stats/incr/nanmape

What differed, or what did you have to work out yourself?

• updated the tests from stats/incr/maape to interleave NaN values and replaced the NaN propagation tests with tests verifying that NaN values are ignored.

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.

I used Claude Code to help generate the tests, benchmarks, and documentation. I reviewed all changes and ran the package tests, examples, and benchmarks locally.

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