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Left censoring and right censoring are important concepts in survival analysis and time-to-event data. Censoring occurs when the exact survival time of an individual is not completely known. In left censoring, the event of interest has already occurred before the observation period begins, but the exact time of occurrence is unknown. It is only known that the event happened before a certain point in time. For example, in a medical study, if a patient already had a disease before entering the study but the exact onset time is not known, the data is left censored. Left censoring mainly deals with observations where the true survival time is less than the observed time limit. Right censoring occurs when the event of interest has not occurred until the end of the observation period. In this case, the exact survival time is unknown, but it is _____ _______ _______ _____ _________.
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