Recalculate timepoint rank as positional integer

Computes row_number() within each (subject_id, parameter_id) group, ordered first by the original numeric timepoint_rank (typically VISITNUM) and then by timepoint_1_name as a tiebreaker. This produces a clean 1, 2, 3, ... sequence that respects the clinical visit ordering rather than relying on lexical sorting of visit names (which miorders e.g. "WEEK 12" before "WEEK 2").

Usage

recalculate_timepoint_rank(df)

Arguments

df

Data frame with at least columns subject_id, parameter_id, timepoint_1_name, and timepoint_rank (original numeric visit number).

Value

The input data frame with timepoint_rank replaced by recalculated positional integers.