May you please help me understand how I could get cov(1,2) for difference between 2 groups in proc mixed? I looked at the book "SAS for Mixed Models, 2nd Edition, by R. Littell et al. (SAS Press)" but still I do not find the answer.
In diffs output, only estimate and stderr included, but not covariance.
ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.