Run Kaplan-Meier analysis

Fits a Kaplan-Meier survival curve, optionally stratified by a grouping variable. Returns the survfit object, log-rank test, and summary statistics.

Usage

run_kaplan_meier(surv_data, strata = NULL)

Arguments

surv_data

Data frame from [prepare_survival_data()] with columns `time_days` and `status`

strata

Column name to stratify by (e.g. "risk_group", "iss_stage", "gender"), or NULL for overall curve

Value

List with components: - `fit`: survfit object - `logrank`: survdiff result (NULL if no strata) - `logrank_p`: log-rank p-value (NA if no strata) - `median_survival`: named vector of median survival times - `n_per_group`: sample sizes per stratum - `strata`: the stratification variable used

See also

Other survival: extract_risk_table(), plot_forest(), plot_km(), prepare_survival_data(), run_cox_regression(), run_km_by_expression(), run_km_by_markers()