<div class="section-label"><span class="num">04</span> Auxiliary</div>
<div class="section-title">Deeper per-threshold <em>diagnostics</em>.</div>
Auxiliary fields support audits and methodology checks. In thin clients they live under <span class="mono">result.auxiliary</span> (Python) or <span class="mono">result$auxiliary</span> (R). Each field is length T when the group is present. They show up most often on Predict and MaxFit; Grid composites usually leave <span class="mono">auxiliary</span> empty.
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## Fields
Access: <span class="mono">result.auxiliary</span>. Example: <span class="mono">result.auxiliary.r_star</span>
| Field | Role |
| --- | --- |
| <span class="mono">phi</span> | Auxiliary diagnostic |
| <span class="mono">lambda_sq</span> | Auxiliary diagnostic |
| <span class="mono">full_var</span> | Full variance term |
| <span class="mono">part_var</span> | Partial variance term |
| <span class="mono">r_star</span> | Reliability-style measure |
| <span class="mono">r_star_percent</span> | Percent-scaled companion to <span class="mono">r_star</span> |
| <span class="mono">rho</span> | Auxiliary diagnostic |
| <span class="mono">n</span> | Count related to the included sample |
| <span class="mono">k</span> | Count related to variables in play |
> [!note]- About these diagnostics
> This page is the field map. Deeper methodology for each diagnostic belongs with your research notes or CSA guidance.
## When they appear
| Path | Typical |
| --- | --- |
| Predict / MaxFit | Present when deeper detail is stored |
| Grid | Usually <span class="mono">None</span> / <span class="mono">NULL</span> on the composite |
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