I learned statistics using SAS 10 years ago and haven't used stats since then. But I'm back. I remember that before conducting a statistical analysis, we first need to check to see if errors are normally distributed. If not normally distributed, I remember that I was transforming data (e.g., log transformation). But I don't remember how to do that on SAS. Please help me on how to write a code for that.

For my analysis, I have "Group" as a between-subjects variable and "Time" as a within-subject variable. Specifically, different groups went through each of 4 different conditions in 4 different ways. For that reason, I'm using Repeated-measures ANOVA.

Thanks in advance