In this case, the paired-t is identical to RM 2x2 ANOVA. But to answer
your question, the first example you give is the right way to handle it.
On 11/5/2020 4:32 AM, Agurne Sampedro Calvete wrote:
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Dear Freesurfer experts,
I am trying to do a longitudinal repeated measures ANOVA 2x2, with two
groups (experimental vs control) and two time points (pre and post
treatment).
Although I have run a paired t-test, now I would like to do a repeated
measures anova 2x2, since I am doing the same analyses with other data
in other softwares.
I am trying to follow the tutorial *MailScanner has detected a
possible fraud attempt from "secure-web.cisco.com" claiming to be*
https://surfer.nmr.mgh.harvard.edu/fswiki/RepeatedMeasuresAnova
<https://secure-web.cisco.com/1xcEvqAuPN3MsqK1JjC6qoZbooZS3kpB4WEU1Lx8hK28grFkOWFgj7ja5TXppcZRh8Vr2s3TJyQKT-sr-c0qt4XJSU7f74cElgVAI4K1nOBI5i5L0YQBzYutTVn-MwCGM_OotAt9VM1mzmm1MUuXbYtZC4-QfIujBH30LAwD5RtwZ6vGRv4JC7ocISixV0s52BsCadrLE2J-3CdqLLZnJRA/https%3A%2F%2Fsurfer.nmr.mgh.harvard.edu%2Ffswiki%2FRepeatedMeasuresAnova>,
but I have several doubts when designing the FSGD file as well as the
contrasts.
How should it be the FSGD file?
I have seen in a previous post the following design for the same
number fo groups and time points:
GroupDescriptorFile 1
Class Subject1
Class Subject2
Variables Tp1vsTp2.GrExp
Tp1vsTp2.GrControl
Input Subject1_time1 Subject1
1 0
Input Subject1_time2 Subject1
-1 0
Input Subject2_time1 Subject2 0 1
Input Subject2_time2 Subject02
0 -1
Design matrix:
1 0 1 0
1 0 -1 0
0 1 0 1
0 1 0 -1
Contrasts (.mtx files):
Tp1vsTp2.GrExp 0 0 1 0
Tp1vsTp2.GrControl 0 0 0 -1
Interaction 0 0 1 -1
Would this design be the correct one to use in this case?
Alternatively, could it be this the correct one?
GroupDescriptorFile 1
Class Subject1
Class Subject2
Variables Tp1vsTp2
Groupxtime
Input Subject1_time1 Subject1 1 1
Input Subject1_time2 Subject1 -1 *-1*
Input Subject2_time1 Subject2 1 *-1*
Input Subject2_time2 Subject02 -1 1
Design matrix:
1 0 1 1
1 0 -1 -1
0 1 1 -1
0 1 -1 1
Contrasts (.mtx files):
Tp1vsTp2 0 0 1 0
Groupxtime Interaction 0 0 0 1
Thank you very much in advance.
Kind regards,
Agurne
Neuropsychology of Severe Medical Conditions Research Team
Dpt of Methods and Experimental Psychology
Faculty of Psychology and Education
University of Deusto
neurolab.deusto.es
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