derive_var_pchg: Derive Percent Change from Baseline
In epijim/admiral: ADaM in R Asset Library

Description Usage Arguments Details Value Author(s) See Also Examples

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

1	derive_var_pchg(dataset)

dataset

The input dataset. Required variables are AVAL and BASE.

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.

The input dataset with an additional column named PCHG

Thomas Neitmann

derive_var_chg()

advs <- tibble::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_pchg(advs)