set_strat function

Stratification setup by covariates

set_strat makes group indicators based on model_options$X_reg_*

set_strat(X, X_reg)

Arguments

• X: A data frame of covariates
• X_reg: The vector of covariates that will stratify the analyses. These variables have to be categorical.

Returns

A list with following elements:

• N_group The number of groups
• group A vector of group indicator for every observation

Details

the results from this function will help stratify etiology or FPR for different strata; the ways of stratification for etiology and FPR can be based on different covariates.