# Parametric Survival Models - Princeton University

k(x) is the **incomplete** gamma function, de ned as I k(x) = Z x 0 k 1e xdx=( k): There is no closed-form expression for the survival function, but there are excellent algorithms for its computation. (R has a function called pgamma that computes the cdf and survivor function. This function calls kthe shape parameter and 1= the scale parameter.)

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