answers below

Dear FS Experts,

I have one group to compare the difference between their preoperative and postoperative after one month. I followed http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/LongitudinalTutorial to process data. I run these command in number 2. Longitudinal Image Processing：

1. recon-all –s sub01_MR1 –all / recon-all –s sub01_MR2 –all

2. recon-all -base sub01 -tp sub01_MR1 -tp sub01_MR2 –all

3. recon-all -long sub01_MR1 sub01 –all / recon-all -long sub01_MR2 sub01 –all

I am confused about choosing which kind of analysis in the page http://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalStatistics And I tried http://surfer.nmr.mgh.harvard.edu/fswiki/RepeatedMeasuresAnova

The “rmanova.fsgd”:

GroupDescriptorFile 1 

Class sub01

Class sub02

…

Variables                        TP1-vs-TP2

Input         sub01_MR1     sub01       1

Input         sub01_MR2     sub01       -1

Input         sub02_MR1     sub02       1

Input         sub02_MR2     sub02       -1

…

“tp1-va-tp2.mtx”:  0 0 … 1 

And I look in one mail in the list, say “one group to use Paird Analysis easier”.  http://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis

“pairs.fsgd”:

GroupDescriptorFile 1

Class Main 

Input         sub04_MR1     Main

Input         sub04_MR2     Main

Input         sub05_MR1     Main

Input         sub05_MR2     Main

…

“paird-diff.fsgd” :

GroupDescriptorFile 1

Class Main 

Variables Age

Input         sub04pair   Main 24

Input         sub05pair   Main 27

…

“mean.mtx”: 1 0

My question：

1. Are the above several files I set up correct？？There are inconsistent results in them… So which one should I choose??

2. I found the increase or decrease a subjects had a great influence on the analysis result, how to filter the participants??

Looking forward to reply, and thanks very much!

Kind regards,

Livia 

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