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Reliability and Survival Methods > Fit Proportional Hazards > The Fit Proportional Hazards Report
Publication date: 04/21/2023

The Fit Proportional Hazards Report

When the proportional hazards model fitting procedure is complete, the Proportional Hazards Fit report appears. This report contains the following sections:

Iteration History

Lists iteration results occurring during the model calculations.

Whole Model

Shows the negative of the log-likelihood function (–LogLikelihood) for the model with and without the covariates. Twice the positive difference between them gives a chi-square test of the hypothesis that there is no difference in survival time among the effects. The degrees of freedom (DF) are equal to the change in the number of parameters between the full and reduced models. See Likelihood, AICc, and BIC in Fitting Linear Models.

Parameter Estimates

Shows the parameter estimates for the covariates, their standard errors, and corresponding 95% confidence intervals. A confidence interval for a continuous column that does not include zero indicates that the effect is significant. A confidence interval for a level in a categorical column that does not include zero indicates that the difference between the level and the average of all levels is significant.

Effect Likelihood Ratio Tests

Shows the likelihood ratio chi-square test of the null hypothesis that the parameter estimates for the effects of the covariates is zero.

Baseline Survival at mean

Plots the baseline function estimates at each event time in the data. The values in the Table report are plotted here.

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