mixed: Random-effects Parameters and Wald Z ?

[Nick Bornschein]

Hi,

I'm using

mixed a b || c:

for a mixed model. From SPSS I know that the estimates of covariance paremeters, in Stata called "Random-effects Parameters", are tested with Wald Z test for each parameter, but in Stata I only get the estimates, Std. Err., and the confidence intervals for "var(_cons)" and "var(Residual)". How can I perform a Wald test on each of the single estimates?

Best
-Nick