derive_var_chg: Derive Change from Baseline

In admiral: ADaM in R Asset Library

Derive Change from Baseline

Description

Derive change from baseline (CHG) in a BDS dataset

Usage

derive_var_chg(dataset)

Arguments

dataset

The input dataset. Required variables are AVAL and BASE.

Details

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

Value

The input dataset with an additional column named CHG

See Also

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

admiral documentation built on Oct. 19, 2023, 1:08 a.m.