The LIFEREG Procedure

Introduction to Survival Analysis Procedures

The LIFEREG Procedure

The LIFEREG procedure fits parametric accelerated failure time models to survival data that may be left, right, or interval censored. The parametric model is of the form

$y = x^' {\beta} + \sigma\epsilon$

where y is usually the log of the failure time variable, x is a vector of covariate values, ${\beta}$ is a vector of unknown regression parameters to be fit, $\sigma$ is an unknown scale parameter, and $\epsilon$ is an error term. The baseline distribution of the error term can be specified as one of several possible distributions, including, but not limited to, the log normal, log logistic, and Weibull distributions. Several texts that discuss these parametric models are Nelson (1990), Lawless (1982), and Kalbfleish and Prentice (1980).

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