I am running one-way ANOVA to determine whether several groups have differing means. I also run post-hoc multiple comparison to determine which means are different. The problem is that I need to have it showed which sets of groups are not different (like REGWQ test does). The problem is that Levene's test shows that the data I use do not have equal variances, thus, I cannot run REGWQ test.
Is there any alternative to REGWQ for cases when equal variances are not assumed (except for non-parametric K-W test)?
I use SPSS but can also try R.