Times relative to an event (typically dosing)
time_calc(time_event, time_obs, units = NULL)
| time_event | A vector of times for events |
|---|---|
| time_obs | A vector of times for observations |
| units | Passed to `base::as.numeric.difftime()` |
A data.frame with columns for:
event_number_beforeThe index of `time_event` that is the last one before `time_obs` or `NA` if none are before.
event_number_afterThe index of `time_event` that is the first one after `time_obs` or `NA` if none are after.
time_beforeThe minimum time that the current `time_obs` is before a `time_event`, 0 if at least one `time_obs == time_event`.
time_afterThe minimum time that the current `time_obs` is after a `time_event`, 0 if at least one `time_obs == time_event`.
time_after_firstThe time after the first event (may be negative or positive).
`time_after` and `time_before` are calculated if they are at the same time as a dose, they equal zero, and otherwise, they are calculated relative to the dose number in the `event_number_*` columns.