Convert Wide Tumor Data to Counting Process (Start/Stop) Format
Source:R/sas_tumor_data.R
tumor_long.RdReplicates the exact SAS DATA step transformation from SAS/STAT User's Guide
(Example 85.7: "Tumor1" dataset). For each subject, intervals (T1, T2] are constructed
across observation times where the time-dependent covariate NPap changes,
with Status equal to Dead only on the terminal interval and 0 elsewhere.
Source
SAS/STAT User's Guide, Example 85.7: Time-Dependent Repeated Measurements of a Covariate. https://support.sas.com/documentation/cdl/en/statug/68162/HTML/default/statug_phreg_examples07.htm
Arguments
- data
A data frame structured like
tumor_wide(). IfNULL,tumor_wide()is used by default.
Value
A tibble with columns:
- ID
Subject ID.
- Time
Original death or censoring time.
- Dead
Original death status.
- Dose
Dose level.
- T1
Start time of the risk interval.
- T2
Stop time of the risk interval.
- NPap
Number of papillomas active during interval (T1, T2].
- Status
Event status at T2 (1 = event, 0 = censored/continuing).