The SURVEYPHREG Procedure

The “Model Information” table displays the two-level name of the input data set, the name and label of the failure time variable, the name and label of the censoring variable and the values that indicate censored times, the model, the name and label of the FREQ variable, the name and label of the WEIGHT variable, the name and label of the STRATA variables, the name and label of the CLUSTER variables, and the method of handling ties in the failure time for the Cox model. The ODS name of the “Model Information” table is “ModelInfo.”

The “Number of Observations” table displays the number of observations that are read and used, the sum of frequencies read and used, the sum of weights read and used, and the weighted sum of frequencies that are read and used in the analysis. The ODS name of the “Number of Observations” table is “NObs.”

The “Summary of the Number of Event and Censored Values” table displays the number of events and censored values. The ODS name of the “Summary of the Number of Event and Censored Values” table is “CensoredSummary.”

The “Summary of the Weighted Number of Event and Censored Values” table displays the weighted number of events and censored values. The ODS name of the “Summary of the Weighted Number of Event and Censored Values” table is “WeightedCensoredSummary.”

The “Class Level Information” table is displayed when there are CLASS variables in the model. The table lists the categories of every CLASS variable that is used in the model and the corresponding design variable values. The ODS name of the “Class Level Information” table is “ClassLevelInfo.”

The “Design Summary” table provides information about the sample design. The table displays the total number of strata that are read and used, and the total number of clusters read and used. The table is displayed only if you specify a STRATA or CLUSTER statement. The ODS name of the “Design Summary” table is “DesignSummary.”

If you specify the LIST option in the STRATA statement, PROC SURVEYPHREG displays a “Stratum Information” table. The ODS name of the “Stratum Information Table” is “StrataInfo.” This table provides the following information for each stratum:

The “Convergence Status” table displays the convergence status of the optimization routine. The procedure displays this table only when you specify the NLOPTIONS statement. The ODS name of the “Convergence Status” table is “ConvergenceStatus.”

The “Model Fit Statistics” table displays the values of –2 log likelihood and the AIC for the null model and the fitted model. The ODS name of the “Model Fit Statistics” table is “FitStatistics.”

The “Testing Global Null Hypothesis: BETA=0” table displays results of the likelihood ratio test and the Wald test for testing the hypothesis that all parameters are zero. The ODS name of the “Testing Global Null Hypothesis: BETA=0” table is “GlobalTests.”

The “Analysis of Maximum Likelihood Estimates” table displays the denominator degrees of freedom, which is computed as described in the section Degrees of Freedom; the maximum likelihood estimate of the parameter; the estimated standard error, computed as the square root of the corresponding diagonal element of the estimated covariance matrix; the t statistic, computed as the parameter estimate divided by the standard error; the p-value of the t statistic with respect to a t distribution with denominator degrees of freedom; and the hazard ratio estimate. The t confidence limits for the parameter estimates and estimated hazard ratios are displayed if you specify the CLPARM or RISKLIMITS option in the MODEL statement. You can specify the DF=NONE option in the MODEL statement to request p-values and confidence intervals from a standard normal distribution. If you specify the VARRATIO=ALL | MODEL | IND option in the MODEL statement, then the variance ratios for model or independence (or both) are displayed. If you specify the SERATIO=ALL | MODEL | IND option in the MODEL statement, then the standard error ratios for model or independence (or both) are displayed.

The ODS name of the “Analysis of Maximum Likelihood Estimates” table is “ParameterEstimates.”

The “Covariance Matrix” table is displayed if you specify the COVB option in the MODEL statement. The table contains the estimated covariance matrix for the parameter estimates. The ODS name of the “Covariance Matrix” table is “CovB.”

The “Hessian Matrix” table is displayed if you specify the HESS option in the MODEL statement. The table contains the Hessian matrix that is evaluated at the estimated regression parameters. The ODS name of the “Hessian Matrix” table is “Hessian.”

The “Inverse Hessian Matrix” table is displayed if you specify the INVHESS option in the MODEL statement. The table contains the inverse of the Hessian matrix evaluated at the estimated regression parameters. The ODS name of the “Inverse Hessian Matrix” table is “InvHessian.”

The “Variance Estimation” table provides the following information:

If you specify the PRINTH method-option for VARMETHOD=BRR, PROC SURVEYPHREG displays the Hadamard matrix that is used to construct replicates for BRR variance estimation. If you provide a Hadamard matrix with the HADAMARD= method-option for VARMETHOD=BRR but the procedure does not use the entire matrix, the procedure displays only the rows and columns that are actually used to construct replicates. The ODS name of the “Hadamard Matrix” table is “HadamardMatrix.”