The results Scrollsheet with the parameter estimates for the
Cox proportional hazard regression model includes the so-called Wald statistic, and the p level for that statistic. This statistic is a test of significance of the regression coefficient; it is based on the asymptotic normality property of maximum likelihood estimates, and is computed as:W =

* 1/Var(

) *

In this formula,

stands for the parameter estimates, and Var(

) stands for the asymptotic variance of the parameter estimates. The Wald statistic is tested against the
Chi-square distribution.