Censored observation

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Definition: Censored observation

To study outcomes of chronic diseases, i.e. observing the time to death, survival data is required. This survival analysis also includes analysing other time to events such as child’s birth, marriages etc. But survival analysis is mainly used in biomedical sciences to observe the time to death of laboratory animals or patients.

The drawback is that the exact survival times are not known. This is called censored observation as it is an observation with incomplete information.

The different types of censoring are:-

-     Right censoring

-   Left censoring

-   Right truncation

- Left truncation

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