melogit
Run random-effects logistic regression on binary outcomes with cluster-level random intercepts, estimating group variation and providing diagnostics.
Instructions
Random-effects logistic regression (Stata melogit). Validation: certified parity evidence. Assumptions: Binary outcome with logit link conditional on random effects; Cluster-level random intercepts (and slopes) are normally distributed; Random effects independent of covariates (no correlated-effects endogeneity). Pre-conditions: Binary (0/1) outcome; Grouping variable for the random effects. Failure modes: Adaptive quadrature likelihood does not converge -> Increase quadrature points or simplify the random-effects structure to a single intercept; Estimated random-effect variance near zero (no clustering) -> Drop the random effect and fit ordinary logit; Perfect separation in a sparse cluster -> Collapse sparse categories or add a weak penalty/prior. Alternatives: sp.mixed, sp.regress. Typical minimum N: 300.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| y | Yes | Outcome variable column name or outcome array. | |
| nAGQ | No | nAGQ parameter (int). | |
| group | Yes | Group or cohort identifier. | |
| detail | No | Payload depth: 'minimal' (~150 tokens) for sub-step calls where only the point estimate is needed; 'standard' (~1K tokens) for diagnostics + coefficient table; 'agent' (~2K tokens, default) adds violations / next_steps / suggested_functions so the LLM can plan its next call without another round-trip. | agent |
| trials | No | trials parameter (Optional[str]). | |
| x_fixed | Yes | x_fixed parameter (Sequence[str]). | |
| x_random | No | x_random parameter (Optional[Sequence[str]]). | |
| as_handle | No | If true, cache the fitted result on the server and return result_id + result_uri alongside the JSON payload so a subsequent tools/call can chain without re-running. | |
| data_path | Yes | Absolute path or URL to a data file. Supported: .csv / .tsv / .txt (delimited), .parquet / .pq, .feather / .arrow, .xlsx / .xls, .dta (Stata), .json / .jsonl. Schemes: file://, s3://, gs://, https://. | |
| result_id | No | Optional handle to a previously-fitted result (returned by an earlier call when as_handle=true). Tools that operate on a fitted object accept this in place of re-supplying data_path + columns. | |
| data_columns | No | Optional column projection. Parquet/Feather/Stata loaders honour this for fast partial reads. | |
| data_sample_n | No | Optional uniform random subsample size (seed=0, deterministic) — useful on huge panels. |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||