Basic Concepts on Censored Data
In industrial and clinical experiments, there are many situations in which units (or subjects) are lost or removed from experimentation before the event of interest occurs. The experimenter may not always obtain complete information on the time to the event of interest for all experimental units or subjects. Data obtained from such experiments are called censored data. Censoring is one of the distinguishing features of lifetime data. Censoring can be either unintentional due to accidental breakage or an individual under study drops out or intentional in which the removal of units or subjects is pre-planned, or both. Censoring restricts our ability to observe the time-to-event and it is a source of difficulty in statistical analysis.
Censoring can occur at either end (single censoring) or at both ends (double censoring). If the event of interest is only known to be occured before a certain time, it is called left censoring. The term “left censored”...
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Tony, N.H.K. (2011). Censoring Methodology. In: Lovric, M. (eds) International Encyclopedia of Statistical Science. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04898-2_163
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