What’s New in SAS/STAT 14.1

PHREG Procedure

The FAST option in the PROC PHREG statement can speed up the fitting of the Breslow and Efron partial likelihoods with counting process style of input. The algorithm is especially efficient when the data have a large number of observations with many event times. It requires only one pass through the data to compute the likelihood, gradient, and Hessian.