The SURVEYPHREG Procedure |
Model Fit Statistics
Suppose the model contains
estimable parameters. Then the following two criteria are displayed for model fit statistics:
2 log likelihood:
where
is a partial pseudo-likelihood function for the corresponding TIES= option as described in the section Partial Likelihood Function for the Cox Model, and
is the maximum pseudo-log-likelihood estimate of the proportional hazards regression coefficients.
Akaike’s information criterion (AIC):
The AIC statistics gives a different way of adjusting the
2 log likelihood statistic for the number of estimable parameters in the model.
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