Introduction
Although PROC PHREG is the newest SAS procedure for doing survival analysis, it is already the most widely used. PROC PHREG (pronounced P-H-REG, not FREG) implements the regression method first proposed in 1972 by the British statistician Sir David Cox in his famous paper “Regression Models and Life Tables” (Journal of the Royal Statistical Society, Series B). It’s difficult to exaggerate the impact of this paper. In the 1992 Science Citation Index, it was cited over 800 times, making it the most highly cited journal article in the entire literature of statistics. In fact, Garfield (1990) reported that its cumulative citation count placed it among the top 100 papers in all of science. These citation counts undoubtedly underestimate ...
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