Censoring
Not all survival data contain censored observations, and censoring may occur in applications other than survival analysis. Nevertheless, because censored survival data are so common and because censoring requires special treatment, it is this topic more than anything else that unifies the many approaches to survival analysis.
Censoring comes in many forms and occurs for many different reasons. The most basic distinction is between left censoring and right censoring. An observation on a variable T is right censored if all you know about T is that it is greater than some value c. In survival analysis, T is typically the time of occurrence for some event, and cases are right censored because observation is terminated before the event ...
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