Running ratio of missing values over time — ratio_missing_over

For each group defined by subject_id and parameter_id (in row order), computes a cumulative proportion of NA values in value. Row \(k\) gets sum(is.na(value[1:k])) / k.

Usage

ratio_missing_over_time(value, subject_id, parameter_id)

Arguments

value: Numeric vector of observed values (may contain NA).
subject_id: Character vector identifying subjects.
parameter_id: Character vector identifying parameters.

Value

Numeric vector, same length as value, with the running missing ratio.