My F Value equals zero

#1
I am using repeated measures analysis with the mixed procedure in SAS. Comparing two periods with about 11 subjects. I have a non-significant P with a F Value of zero. Is this a concern? I've never seen a zero for an F.
 

JohnM

TS Contributor
#2
An F statistic of 0 would imply that the variance between periods is 0, or in other words, their means are exactly equal to each other, so I'm sure there's something wrong with your program.