---
title: "Grouped PSIS-LOO Influence"
output: rmarkdown::html_vignette
vignette: >
  %\VignetteIndexEntry{Grouped PSIS-LOO Influence}
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteEncoding{UTF-8}
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(collapse = TRUE, comment = "#>")
```

Pointwise PSIS-LOO diagnostics may be aggregated by a declared participant,
item, condition, or other observation-level grouping variable.

```{r, eval=FALSE}
group_loo <- loo_group_influence_table(
  loo_atlas,
  group = "participant_id"
)

plot_loo_group_influence(group_loo)
plot_loo_group_elpd(group_loo)
```

Aggregation supports review of concentrated predictive influence. It never
removes a group automatically.