stan-dev/loo

export srs_diff_est

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#333 opened on Mar 1, 2026

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good first issue

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Description

loo_subsample() can sometimes be over-complex. srs_diff_est() is a non-exported internal function used by loo_subsample. srs_diff_est() implements difference estimator Equations 7-9 of Magnusson et al., 2020. It would be useful to export this function and provide user targeted function with documentation.

Contributor guide

Research direction
Export the internal function srs diff est from the loo package by adding it to the NAMESPACE file and writing a documentation file using roxygen2. Ensure the function is accessible to users with proper help documentation referencing Equations 7-9 from Magnusson et al., 2020.
Tech stack
r
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
R
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80