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 LISTSERV Archives SPM Home SPM March 2009

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Subject:

Flexible Factorial ANOVA: contrasts

From:

Lucina Uddin <[log in to unmask]>

Reply-To:

Lucina Uddin <[log in to unmask]>

Date:

Mon, 30 Mar 2009 18:53:48 +0100

Content-Type:

text/plain

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 text/plain (20 lines)
 ```Hi, I have a question regarding a specific set of contrasts I'd like run. Essentially I have three factors (Subject (22 total), Region (3 levels), Side (2 levels). I'd like to set up the following contrasts in SPM: 1. (F) Main effect of region: zeros (1,22) -1 0 1 0 0 -.5 0 .5 -.5 0 .5 2. (F) Main effect of side: zeros (1,22) 0 0 0 1 -1 ? ? ? ? ? ? 3. (F) Interaction of region by side: zeros (1,22) ? ? ? ? ? ? ? ? ? ? ? 4. (T) Region 1 - (Region 2, 3): zeros (1,22) ? ? ? ? ? ? ? ? ? ? ? 5. (T) Region 2 - (Region 1, 3): zeros (1,22) ? ? ? ? ? ? ? ? ? ? ? 6. (T) Region 3 - (Region 1, 2): zeros (1,22) ? ? ? ? ? ? ? ? ? ? ? 7. (T) Side Right - Side Left: zeros (1,22) 0 0 0 1 -1 ? ? ? ? ? ? 8. (T) Side Right - Side Left: zeros (1,22) 0 0 0 -1 1 ? ? ? ? ? ? I'm most confused about numbers 4, 5, 6 (how to contrast one Region against the other two) and also how to represent the interaction terms. I would greatly appreciate any assistance with this setup. Thanks for your time, Sincerely, Lucina Uddin ```

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