derive_vars_transposed.md
In admiral: ADaM in R Asset Library

derive_vars_transposed Test 3: filtering the merge dataset works

      with relationship 'many-to-one'

Code
  derive_vars_transposed(dataset, dataset_merge, by_vars = exprs(USUBJID),
  key_var = TESTCD, value_var = VALUE, filter = TESTCD == "T01", relationship = "many-to-one")
Output
  # A tibble: 3 x 3
    USUBJID  VAR1   T01
    <chr>   <dbl> <dbl>
  1 P01         3    31
  2 P02        31     3
  3 P03        42    NA