Calculate number of subjects by treatment and stratum

Calculate the number of subjects by treatment and stratum.

Usage

n_subj(dat, cell_index, subjectid_var, ...)

Arguments

dat

data.table. The analysis data set.

cell_index

A vector of integers referencing the rows of dat (as specified by the INDEX_ column in dat) that match the population to be analyzed. See the "Endpoint Events" vignette in ramnog for more information.

subjectid_var

character. Name of the subject identifier variable in the data (default is "USUBJID").

...

Optional parameters.

Value

A data.table containing the number of subjects for the given combination of treatment and stratum.