The SAS System                                                                                                         1

The PHREG Procedure

                 Model Information

Data Set                 WORK.A
Dependent Variable       tl           Entering time
Dependent Variable       tr
Censoring Variable       delta
Censoring Value(s)       0
Ties Handling            BRESLOW


Number of Observations Read         679
Number of Observations Used         679


Summary of the Number of Event and Censored Values

                                     Percent
   Total       Event    Censored    Censored

     679          56         623       91.75


                       Convergence Status

         Convergence criterion (GCONV=1E-8) satisfied.


         Model Fit Statistics

                 Without           With
Criterion     Covariates     Covariates

-2 LOG L         654.413        568.902
AIC              654.413        576.902
SBC              654.413        585.004


        Testing Global Null Hypothesis: BETA=0

Test                 Chi-Square       DF     Pr > ChiSq

Likelihood Ratio        85.5110        4         <.0001
Score                   79.5688        4         <.0001
Wald                    67.3491        4         <.0001


                     Analysis of Maximum Likelihood Estimates

                    Parameter      Standard                                  Hazard
Parameter    DF      Estimate         Error    Chi-Square    Pr > ChiSq       Ratio

logafe        1       2.22305       0.43693       25.8864        <.0001       9.235
yfe10         1      -0.09451       0.31573        0.0896        0.7647       0.910
yfe100        1      -1.25502       0.50620        6.1469        0.0132       0.285
logexp        1       0.76606       0.17397       19.3896        <.0001       2.151