Bootstrap class.
Slots
datadata frame to be bootstrapped. Column 'BS_ID' is mandatory and corresponds to the original row ID from the bootstrap. It must be numeric and unique. Other columns are covariates to be bootstrapped (row by row).
replacementvalues can be reused or not, logical
randomvalues are drawn randomly, logical
export_idtell CAMPSIS if 'BS_ID' must be exported into the dataset, logical
