binormal_roc_strat: Binormal ROC curve for stratified data
In tamytsujimoto/surveyROC: ROC curve for survey data

Compute the combined binormal ROC curve for stratified data

binormal_roc_strat(
  x,
  freq_strata,
  mean0_strat,
  mean1_strat,
  sigma0_strat,
  sigma1_strat,
  by_strata = FALSE
)

`x`	numeric vector between 0 and 1
`freq_strata`	numeric vector containing frequency of strata
`mean0_strat`	numeric vector of mean for class label 0 (healthy) for all strata
`mean1_strat`	numeric vector of mean for class label 1 (diseased) for all strata
`sigma0_strat`	numeric vector of standard deviation for class label 0 (healthy) for all strata
`sigma1_strat`	numeric vector of standard deviation for class label 1 (diseased) for all strata
`by_strata`	set to TRUE if ROC curve per strata is desired