Calculate number of events by treatment and stratum

Calculate the number of events by treatment and stratum.

Usage

n_event(dat, event_index, cell_index, subjectid_var, ...)

Arguments

dat

data.table. The analysis data set.

event_index

vector of integers that index the rows in dat that match the definition of an 'event'. Matching is done via the INDEX_ column in dat.

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 events for the given combination of treatment and stratum.