For an F-test (multiple rows in the contrast), there should not be a sign to the p-values. Are you seeing a sign?
On 9/14/13 8:01 AM, ye tian wrote:
Dear Freesurfers, If I understand correctly, the red (positive) means design*contrast>0; blue (negative) means design*contrast<0. Is this correct? How should I interpret the color scales (signs) when my contrast has more than one rows? For example, I have one discrete factor with three levels, control, drug1 and drug2; and my test hypothesis is "Is there a group effect", with the following contrast 1 -1 0 1 0 -1 In this case, what does the color scale mean? Thank you very much! Sincerely, Ye
On Fri, Sep 6, 2013 at 9:16 PM, Douglas Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:
yes, that is correct doug On 9/6/13 5:48 PM, Yang, Daniel wrote:Hi FreeSurfer experts, Let's say I have two class variables: Sex (female, male) Dx (patient, control) I see that the analysis results show the following: Does the average thickness, accounting for Dx, diff between female and male? Red means: female > male Does the average thickness, accounting for Sex, diff between patient and control? Red means: patient > control Is there a Sex-Dx interaction in the mean thickness? Red means either (a) the female > male effect is stronger in patient (vs. control); or (b) the patient > control effect is stronger in female (vs. male) Is my interpretation correct? Thanks! Daniel -- Yung-Jui "Daniel" Yang, PhD Postdoctoral Researcher Yale Child Study Center New Haven, CT (203) 737-5454 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.