|Date: ||Tue, 5 Apr 2011 18:11:56 -0400|
|Reply-To: ||Charla Lopez <charla3@AOL.COM>|
|Sender: ||"SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>|
|From: ||Charla Lopez <charla3@AOL.COM>|
|Subject: ||Re: Help with interaction with contrasts|
Thanks for your help Ryan. I am still unable to run the model. I get the
message "Custom hypothesis test X will not be preformed because the L matrix
is not estimable."
Here's a statement of the problem: I have 4 treatment groups and 2
measurement points of a single dependent variable. I am trying to run a
model with special contrasts so I can assess "contrast by time." All 4
groups represent treatment conditions with a combination of any set of 3
components. Here is the setup:
Cond 1) B
Cond 2) AB
Cond 3) ABC
Cond 4) A
These are the 3 contrasts of interest:
1) Condition 3 v. 4
2) Condition 2 v. 1
3) Conditions 1, 2, and 4 v. 3
A single time point model looks like this:
GLM DV BY COND
/CONTRAST (COND) SPECIAL (1 1 1 1 0 0 1 -1 1 -1 0 0 1/3 1/3 1/3 -1).
I need to use the same contrasts in a repeated measures model to assess
"condition by time."
Any suggestions for how to model this?
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