admiral (version 1.1.1)

derive_var_chg: Derive Change from Baseline

Description

Derive change from baseline (CHG) in a BDS dataset

Usage

derive_var_chg(dataset)

Value

The input dataset with an additional column named CHG

Arguments

dataset

Input dataset AVAL and BASE are expected.

Details

Change from baseline is calculated by subtracting the baseline value from the analysis value.

See Also

BDS-Findings Functions that returns variable appended to dataset: derive_basetype_records(), derive_var_analysis_ratio(), derive_var_anrind(), derive_var_atoxgr(), derive_var_atoxgr_dir(), derive_var_base(), derive_var_ontrtfl(), derive_var_pchg(), derive_var_shift()

Examples

library(tibble)

advs <- tribble(
  ~USUBJID, ~PARAMCD, ~AVAL, ~ABLFL, ~BASE,
  "P01",    "WEIGHT", 80,    "Y",    80,
  "P01",    "WEIGHT", 80.8,  "",     80,
  "P01",    "WEIGHT", 81.4,  "",     80,
  "P02",    "WEIGHT", 75.3,  "Y",    75.3,
  "P02",    "WEIGHT", 76,    "",     75.3
)
derive_var_chg(advs)