11.3 Censored Data

Source: https://www.reddit.com/r/statisticsmemes/comments/u21swt/what_i_learned_in_survival_analysis_so_far/

Source (slightly modified): https://towardsdatascience.com/introduction-to-survival-analysis-6f7e19c31d96

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.