Data from collett 2003 example 12 10 proc lifetest

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Unformatted text preview: itive or negative. Data from Collett (2003) Example 1.2. 10 Proc Lifetest TIME data=breast_cancer ; surv_months * died(0); STRATA positive_stain; positive_ Percent Stratum stain Total Failed Censored Censored 1 0 13 5 8 61.54 2 1 32 21 11 34.38 Pr > Test Chi-Square DF Chi-Square Log-Rank 3.5150 1 0.0608 Wilcoxon 4.1800 1 0.0409 -2Log(LR) 4.3563 1 0.0369 11 Which test is appropriate here? Test gives no estimate of difference between groups. 12 PHreg: proportional hazards regression Proc PHreg MODEL ; time * event-status ( censored_value ) = predictors / risklimits CI for hazard ratios ties=efron ; Proc PHreg fitting method option data = breast_cancer; model surv_months * died(0) = positive_stain / risklimits ties=efron; The response is specified in the same way as for Proc Lifetest. 13 Analysis of Maximum Likelihood Estimates DF Parameter positive_stain Parameter Estimate Standard Error Chi-Square Pr > ChiSq 1 0.90933 0.50089 3.2957 0.0695 Analysis of Maximum Likelihood Estimates Parameter positive_stain Hazard Ratio 95% Hazard Ratio Confidence Limits 2.483 0.930 6.626 Hazard rate in the posit...
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This note was uploaded on 11/21/2011 for the course PUBH 6470 taught by Professor Williamthomas during the Fall '11 term at University of Florida.

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