stan-dev/loo

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loo R package for approximate leave-one-out cross-validation (LOO-CV) and Pareto smoothed importance sampling (PSIS)

Stars: 157
Forks: 38
Open beginner issues: 0
Indexed issues: 43
Avg merge: 4d 16h
Merged PRs (30d): 2

Dominant language: R
License: No license data
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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43 issues indexed so far

Extend loo_plot_difference Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/loo#394 · 1 comment · Opened Sep 9, 2026
Update output structure of `loo_compare` for subsampling case Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

stan-dev/loo#392 · Opened Sep 2, 2026
loo_model_weights() rejects PSIS-LOO objects with equal observations but different posterior sample sizes Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

stan-dev/loo#389 · Opened Aug 11, 2026
Clean up issues Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

stan-dev/loo#388 · 1 reaction · Opened Jul 24, 2026
Detect non-finite `log_lik` (`Inf` / `NaN`) and explicitely inform the user Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

stan-dev/loo#386 · 1 comment · Opened Jul 24, 2026
Mutation testing Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

stan-dev/loo#385 · Opened Jul 23, 2026
LLM code optimizations Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

stan-dev/loo#384 · Opened Jul 23, 2026
Improve warnings and messages behavior Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/loo#353 · 1 reaction · Opened Apr 9, 2026
Feature Request: public subset() method for psis objects Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

stan-dev/loo#343 · 2 comments · Opened Mar 28, 2026
export srs_diff_est Open

good first issue

Difficulty 3/5 1-2 days Newbie friendliness 45/100

stan-dev/loo#333 · 10 comments · Opened Mar 1, 2026
Parallelisation of loo using Mirai Open

stan-dev/loo#308 · 6 comments · 1 assignee · Opened Oct 21, 2025
New functions for better support for different scores and metrics Open

stan-dev/loo#281 · 15 comments · 1 assignee · Opened Feb 1, 2025
`neg_binomial_2_rng` can obstruct `loo_moment_match()` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/loo#274 · 2 comments · Opened Sep 15, 2024
"Error in if (varx == 0) { : missing value where TRUE/FALSE needed" with fit$loo() but not loo::loo(fit$draws("log_lik")) Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

stan-dev/loo#272 · 16 comments · Opened Jul 4, 2024
Add support functions for Mixture IS LOO Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

stan-dev/loo#270 · 1 reaction · Opened Jun 25, 2024
Add support for Jacobian adjustment Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

stan-dev/loo#265 · 1 reaction · Opened Apr 5, 2024
Port C++ psis code to loo? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/loo#260 · 1 comment · Opened Mar 14, 2024
Use more functions from the posterior package Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

stan-dev/loo#249 · 1 comment · Opened Feb 27, 2024
Improved mcse_elpd_loo Open

feature

stan-dev/loo#245 · 4 comments · 1 assignee · Opened Feb 15, 2024
Inconsistent Pareto k-values for SIS? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/loo#227 · 10 comments · Opened Aug 1, 2023
(loo_)(s)crps could ask for only one argument with predictions Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/loo#223 · 5 comments · Opened Apr 12, 2023
loo_compare for crps and loo_crps Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

stan-dev/loo#220 · 10 comments · Opened Mar 31, 2023
loo_predictive_metric and loo_crps could accept psis objects to reduce computation Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/loo#213 · 2 comments · Opened Mar 22, 2023
Moment matching with iwmm package Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

stan-dev/loo#212 · 5 comments · Opened Feb 27, 2023
Clarification on using loo_moment_match() with non-Stan objects Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

stan-dev/loo#209 · 4 comments · Opened Dec 1, 2022
Add R2 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/loo#201 · 6 comments · Opened May 10, 2022
Change n_eff to ESS Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

stan-dev/loo#192 · 5 comments · Opened Dec 2, 2021
Smoothed Bayesian Bootstrap Open

feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/loo#184 · Opened Aug 9, 2021
Error when running loo with moment_match = TRUE on rstan model from previous session Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

stan-dev/loo#183 · 5 comments · Opened Aug 1, 2021
Calibration/Refinement Decomposition of LOO Scores Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/loo#179 · 2 comments · Opened Jun 12, 2021
Use JuliaCall to Speed Up PSIS Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/loo#177 · 45 comments · Opened May 27, 2021
Add hierarchical stacking Open

feature

Difficulty 5/5 Over a week Newbie friendliness 18/100

stan-dev/loo#174 · 3 comments · Opened May 17, 2021
Using kfold for model selection after splitting by groups Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/loo#169 · 6 comments · Opened Apr 25, 2021
Handle frequency weights with loo Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/loo#168 · 3 comments · Opened Feb 19, 2021
Use posterior::autocovariance() once on CRAN Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

stan-dev/loo#157 · 6 comments · Opened Sep 28, 2020
Store information about which sampling method or algorithm was used Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/loo#137 · 1 comment · Opened Feb 13, 2020
user defined loss/utility functions Open

feature

Difficulty 5/5 Over a week Newbie friendliness 30/100

stan-dev/loo#135 · 2 reactions · Opened Feb 11, 2020
plot method for two loo objects Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 25/100

stan-dev/loo#127 · 1 comment · Opened Oct 22, 2019
accelerate the optimization algorithm in stacking Open

stan-dev/loo#119 · 1 comment · 1 assignee · Opened Aug 30, 2019
Feature request: progress indicator Open

feature help wanted

Difficulty 4/5 3-5 days Newbie friendliness 30/100

stan-dev/loo#91 · 4 comments · Opened Dec 7, 2018
Averaging predictive distributions Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/loo#83 · 9 comments · Opened May 3, 2018
problems using loo in clogit models Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/loo#44 · 10 comments · Opened Mar 29, 2017
Speed up loo calcs Open

feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/loo#33 · 12 comments · Opened Aug 18, 2016

stan-dev/loo

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