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Survival analysis is the analysis of time-to-event data. The event may be death (hence the term survival), or it may be some other event such as cancer recurrence or a stroke. In engineering, when analyzing mechanical failures, the topic is known as reliability analysis. Although these methods are traditionally used for time-to-event data, they are also applicable to other types of data, for example, the total amount paid due to an accident. As with many statistical methods, there are parametric and nonparametric methods for survival analysis. Parametric models assume that the data come from some parametric distribution such as the normal distribution, which is defined by two parameters, the mean and the standard deviation. Nonparametric models do not assume a given parametric distribution. Data have

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