What is formula for calculating Simple Contrasts test for within-groups ANOVA?

guy

New Member
#1
I need to be able to calculate long hand some Planned Comparison test for a Within-Groups ANOVA framework. I understand the most common tests in such a situation are "Contrasts" test including: Simple Contrasts, Repeated Contrasts, Deviation Contrasts, among other Contrasts test

I assume that the Simple Contrasts test is the simplest. So, I figured I would focus on this one first. Any link to an example fleshing out those calculations would be great.
 

nbjo

New Member
#2
I think you mean syntax. Search for 'SPSS syntax for GLM repeated measures contrasts'. The command in SPSS for contrasts is LMATRIX.

Simple contrasts option within repeated measures I believe gives you a trend analysis. You can get Bonferroni from the options menu.
 

guy

New Member
#3
Actually, I did mean formula. Something I could use to calculate Simple Contrasts. I don't have SPSS. Thus, I do not have access to their proprietary macros. Doing your search got me some interesting results such as the link below.

http://www.ats.ucla.edu/stat/spss/seminars/Repeated_Measures/

The latter disclosed its underlying "syntax"
http://www.ats.ucla.edu/stat/spss/seminars/Repeated_Measures/repeat.txt

... which was no help since it relied on SPSS' syntax. And, I need an actual formula.