11.3 Censored Data

Observations are censored when the information about their survival time is incomplete.

Examples:

  • Loss to follow-up

  • Withdrawal from study (line 5)

  • No event/outcome by end of fixed study period (line 3 and 2)

These are examples of right censoring.

Left censoring and interval censoring are also possible, but the most frequent is right censoring.