I was running a Proc Mixed model a test using code from the SAS website. I found that the solution option for the random statement produced the random effects coefficients (intercept and slope) but also produced a standard error of the prediction that was then used to calculate a t statistic for both coefficients.  I have never seen this anywhere else and it seems that calculating the t stat might be useful.  Can anyone say exactly how the standard error of the predictions was calculated? The manual is very vague.   ... View more