Get Total Subject Count

Extract total subject count from ADaMData or calculate from data frame. For ADaMData, uses the computed subject_n property which respects population filters.

Usage

get_subject_n(data, population = NULL, subject_var = "USUBJID")

Arguments

data

ADaMData object or data frame

population

Population filter for data frames (optional)

subject_var

Subject variable name for data frames (optional)

Value

Integer count of distinct subjects

Examples

if (FALSE) { # \dontrun{
# From ADaMData - uses computed property
adam <- ADaMData(data = adsl, domain = "ADSL", population = "FAS")
n_subj <- get_subject_n(adam)

# From data frame
n_subj <- get_subject_n(adsl, population = "FAS")
} # }