On Jan 8, 3:20 pm, Warren.Schlec...@TPWD.STATE.TX.US (Warren Schlechte) wrote: > Since the t-test is a simplification of the F-test, and since with a > single degree of freedom, t2=3DF, I would suggest you run only F-tests, > and don't worry about a t-test, then make the adjustment from F to t in > the 1 df case at the end (or report the F-test). > > This sounds like what you're suggesting, and it makes sense to me. > > Warren Schlechte >

The way I implemented it was to use proc glm with hovtest=Levene (can be changed) in the MEANS statement to get the homogeneity of variance. I then rerun proc glm and if the HoV test was significant I use "/ hovtest=Levene welch" in the means statement or if the HoV test was not significant then use means without them.