# Wald $\chi^2$ value for a probit model

I have fit a probit model in R. However, in addition to the $z$- and $p$-values, I would like to know the Wald $\chi^2$ values for the individual explanatory variables. How do I obtain / calculate the Wald $\chi^2$ values for parameter estimates?

You can compute the Wald $\chi^2$ values by squaring the $z$-values.
• +1, you might note that all of the $\chi^2$s will have $1$ degree of freedom. – gung - Reinstate Monica Jan 13 '14 at 20:28