例17-05计算结果.lst

SAS应用_医学统计学的例题程序及其结果,学习SAS的必备资料.

                                       The SAS System         09:34 Monday, April 1, 2002  74

                                     The PHREG Procedure

           Data Set: WORK.EX17_5
           Dependent Variable: T
           Censoring Variable: Y
           Censoring Value(s): 1
           Ties Handling: BRESLOW


                                  Summary of the Number of
                                  Event and Censored Values

                                                             Percent
                           Total       Event    Censored    Censored

                              63          26          37       58.73



Step  1: Variable X4 is entered.  The model contains the following explanatory variables.

         X4


                           Testing Global Null Hypothesis: BETA=0

                         Without        With
          Criterion    Covariates    Covariates    Model Chi-Square

          -2 LOG L        201.994       187.690      14.304 with 1 DF (p=0.0002)
          Score              .             .         13.040 with 1 DF (p=0.0003)
          Wald               .             .         10.265 with 1 DF (p=0.0014)




Step  2: Variable X5 is entered.  The model contains the following explanatory variables.

         X4        X5


                           Testing Global Null Hypothesis: BETA=0

                         Without        With
          Criterion    Covariates    Covariates    Model Chi-Square

          -2 LOG L        201.994       182.777      19.217 with 2 DF (p=0.0001)
          Score              .             .         17.594 with 2 DF (p=0.0002)
          Wald               .             .         14.579 with 2 DF (p=0.0007)



NOTE: No (additional) variables met the 0.05 level for entry into the model.
                                       The SAS System         09:34 Monday, April 1, 2002  75

                                     The PHREG Procedure

                          Analysis of Maximum Likelihood Estimates

                         Parameter      Standard       Wald          Pr >           Risk
    Variable    DF        Estimate        Error     Chi-Square    Chi-Square       Ratio

    X4           1        1.761621       0.54791      10.33726        0.0013       5.822
    X5           1        0.931330       0.44455       4.38899        0.0362       2.538

                                Summary of Stepwise Procedure

                    Variable          Number      Score          Wald          Pr >
      Step    Entered     Removed         In    Chi-Square    Chi-Square    Chi-Square

         1    X4                           1       13.0399             .        0.0003
         2    X5                           2        4.7039             .        0.0301