It will be much easier if you subtract time point 1 from 2 then do a
two-group t-test. See
https://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis

On 02/18/2016 05:37 AM, María Díez Cirarda wrote:
> Dear FS experts,
>
> I am trying to do a longitudinal analysis with a Repeated Measures
> ANOVA 2x2, with two groups (experimental and control group) and two
> times (pre and post treatment).
>
> First, I have followed the Longitudinal Processing Tutorial:
> 1) I have 2 acquisitions per subject so, I created a subject template
> (BASE) for each pair of subjects
> 2) I created the two longitudinal runs
>
> Now I am confused, because I don´t know wether I have to:
> 1) do a Longitudinal QDEC table with two columns (time and group)
> or 2) create a FSGD File, (or a DOSS file?) and create the contrasts.
>
> If I have to create the FSGD file, Would this be OK?
>
> GroupDescriptorFile 1
> Class Subject 1
> Class Subject 2
> Variables                               Tp1vsTp2.Gr1Exp
>       Tp1vsTp2.Gr2Control
> Input Subject1-tp1  Subject1            1                        0
> Input Subject1-tp2  Subject1           -1                        0
> Input Subject2-tp1  Subject2             0                         1
> Input Subject2-tp2  Subject2             0                        -1
>
> Contrasts:
> Mtx file:
> 0 0 1 0
> 0 0 0 -1
> 0 0 1 -1
>
> Were do I have to create the FSGD file? In subjects folder or inside
> qdec folder?
> The group descriptor file must be "subject1" "subject2", or should I
> introduce the specific names of the folders from the subjects of my study?
>
> Thank you in advance,
>
> Maria.
>
>
>

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MGH-NMR Center
greve@nmr.mgh.harvard.edu
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Fax: 617-726-7422

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