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Hi,
I'm designing an analysis that will have 6 groups (two factors/three levels). I was wondering if I could get some input regarding my contrast for the group effect. Based on the group effect contrast under the FSGD examples for 3 groups I've written a five line contrast file that compares group 1 against the other 5 groups.
1-1 0 0 0 0 1 0 -1 0 0 0 1 0 0 -1 0 0 1 0 0 0 -1 0 1 0 0 0 0 -1
Which from my understanding should cover the rest of the contrasts such as 2v5 3v6 and etc. Is my understanding of this correct?
Yes, that is correct. It is testing the null hypothesis A=B=C=D=E=F. That hypothesis will be rejected if A is different from B-F, which is what you are testing. The other contrasts are redundant (and would cause an error if you added them to the contrast matrix)z
On 10/16/19 12:03 PM, cody samth wrote:
External Email - Use Caution
Hi,
I'm designing an analysis that will have 6 groups (two factors/three levels). I was wondering if I could get some input regarding my contrast for the group effect. Based on the group effect contrast under the FSGD examples for 3 groups I've written a five line contrast file that compares group 1 against the other 5 groups.
1-1 0 0 0 0 1 0 -1 0 0 0 1 0 0 -1 0 0 1 0 0 0 -1 0 1 0 0 0 0 -1
Which from my understanding should cover the rest of the contrasts such as 2v5 3v6 and etc. Is my understanding of this correct?
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Great thanks.
On Fri, Oct 18, 2019, 10:09 AM Greve, Douglas N.,Ph.D., < DGREVE@mgh.harvard.edu> wrote:
Yes, that is correct. It is testing the null hypothesis A=B=C=D=E=F. That hypothesis will be rejected if A is different from B-F, which is what you are testing. The other contrasts are redundant (and would cause an error if you added them to the contrast matrix)z
On 10/16/19 12:03 PM, cody samth wrote:
External Email - Use CautionHi,
I'm designing an analysis that will have 6 groups (two factors/three levels). I was wondering if I could get some input regarding my contrast for the group effect. Based on the group effect contrast under the FSGD examples for 3 groups I've written a five line contrast file that compares group 1 against the other 5 groups.
1-1 0 0 0 0 1 0 -1 0 0 0 1 0 0 -1 0 0 1 0 0 0 -1 0 1 0 0 0 0 -1
Which from my understanding should cover the rest of the contrasts such as 2v5 3v6 and etc. Is my understanding of this correct?
Freesurfer mailing listFreesurfer@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
freesurfer@nmr.mgh.harvard.edu
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cody samth -
Greve, Douglas N.,Ph.D.