253-2010 An Overview of the CLASS, CONTRAST, and HAZARDRATIO Statements
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This site is dedicted to my SAS Global Forum 2010 paper 253-2010
"An Overview of the CLASS, CONTRAST, and HAZARDRATIO Statements in the SAS® 9.2 PHREG Procedure".
Here you can find a copy of the paper in PDF form, copies of the MS/PowerPoint 2007 presentation, and the data & code used in generating results for the paper.
The PHREG procedure fits a number of models collectively known as Cox regression models, including the wellknown Cox proportional hazards model. This paper provides an overview of several new features, including three new statements (CLASS, CONTRAST, and HAZARDRATIO) in PROC PHREG. The emphasis is on illustrative examples of comparisons for main effects and interaction models via the new statements. The paper concentrates on common CLASS variable parameterization methods such as reference coding and GLM coding. Caveats regarding CLASS variables and time (including time-dependent covariates) are also discussed. This paper is intended for an intermediate-level audience that has some familiarity with Cox regression models and PROC PHREG.
View the pdf for.