Calculates the p-value for treatment-by-subgroup interaction using likelihood ratio test. Used internally by forest plot functions.
Usage
calculate_interaction_pvalue(
df,
subgroup_var,
endpoint_type,
time_var,
event_var_use,
trt_var
)Arguments
- df
Data frame containing analysis data with treatment, subgroup, and endpoint variables.
- subgroup_var
Character. Name of the subgroup variable column.
- endpoint_type
Character. Either "tte" for time-to-event (uses Cox regression) or "binary" for binary endpoints (uses logistic regression).
- time_var
Character. Name of time variable column (only used when endpoint_type = "tte").
- event_var_use
Character. Name of event indicator column (only used when endpoint_type = "tte").
- trt_var
Character. Name of treatment variable column.