Re: Questions about ANOVAs and Sphericity

Posted by rohanp16 on Apr 13, 2011; 3:10am
URL: http://spssx-discussion.165.s1.nabble.com/Questions-about-ANOVAs-and-Sphericity-tp4297706p4299654.html

1) The 'Multivariate Tests' table doesn't compute results for my Factor B (having 21 levels) and it says

"Cannot produce multivariate test statistics because of insufficient residual degrees of freedom"

I'm guessing this occurs because of the fact that I have more levels of that factor than participants ?

Could this insufficient residual degrees of freedom be the reason Mauchly's Test of Sphericity is unable to provide a result for this factor B ?

2) The code for the syntax I printed to follow up interaction effects, gives out a 'Multivariate Tests' table rather than a Univariate one, how can this be changed ?

Thanks a lot, much appreacted Rich, Paul and Bruce