You need to put in age, weight, AND age*weight. If you have two classes
and use DODS, then the contrast would be
0 0 0 0 0 0 0.5 0.5
On 4/13/18 8:02 PM, David S Lee wrote:
Hi Douglas,
Thank you for your reply.
To follow up, I am setting up GLM analysis with 1 categorical variable
and 1 continuous variable (age X weight). Myfsgd looks like this:
/GroupDescriptorFile 1/
/Title Cortical Thickness Interaction between Age and Weight/
/Class class1 plus blue/
/Class class2 circle green/
/Variable Demean Age X Demean Weight/
/Input001Class1500/
/Input002Class2433/
/.../
I want to test for an interaction between age and weight while
controlling forgroup. Instead ofputting-inage and weight separately, I
multiply them to test for interaction. Can you tell me if following
contrast vector will correctly test for this?
/0 0 0.5 0.5/
/
/
Thank you for your time,
/
/
--
David S. Lee
Associate Research Specialist
Center for Healthy Minds
University of Wisconsin - Madison
(608) 890-1115 <tel:%28608%29%20890-1115>
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