derive_var_pchg: Derive Percent Change from Baseline

In admiral: ADaM in R Asset Library

Derive Percent Change from Baseline

Description

Derive percent change from baseline (PCHG) in a BDS dataset

Usage

derive_var_pchg(dataset)

Arguments

dataset

Input dataset AVAL and BASE are expected. Default value none

Details

Percent change from baseline is calculated by dividing change from baseline by the absolute value of the baseline value and multiplying the result by 100.

Value

The input dataset with an additional column named PCHG

See Also

derive_var_chg()

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_chg(), derive_var_ontrtfl(), derive_var_shift(), derive_vars_crit_flag()

Examples

library(tibble)

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

admiral documentation built on June 26, 2025, 1:08 a.m.