Re: [Freesurfer] Creating the FSDG file for more than one discrete variable

Hi Hanna, use #2 doug

On 08/20/2014 10:36 AM, Isotalus, Hanna wrote:

Dear Freesurfer gurus,

I am trying to create an FSDG file for my data set and I have a question regarding discrete variables.

So say this is my data: Two discrete variables (two with two levels, one with eight), one continuous variable.

I'm interested in one discrete variable (Patient/Control) with two levels and want to account for the effect of the others in the analysis.

How should I construct my FSDG file? Can I have three columns for discrete variables (1) or should I have one column (2)? Or is there another way?

(1) So should I do: GroupDescriptorFile 1

Title GroupAnalysis

Class Male

Class Female

Class Patient

Class Control

Class ImagingsiteOne

Class ImagingsiteTwo

[and so on...]

Class OccupationEight

Variables Age

Subject1 Male Patient ImagingsiteThree 16

Subject2 Male Control ImagingsiteSeven 18

Subject3 Female Patient ImagingsiteThree 23

And so on

OR

(2) Should I do

GroupDescriptorFile 1

Title GroupAnalysis

Class MalePatientImagingsiteOne

Class MalePatient​ImagingsiteTwo

[and so on..]

Class MalePatient​ImagingsiteEight

Class MaleControlImagingsiteOne

[and so on...]

Class FemalePatient​ImagingsiteOne

[and so on until...]

Class FemaleControl​ImagingsiteEight

Variables Age

Subject1 MalePatientImagingsiteThree 16

Subject2 MaleControlImagingsiteSeven 18

Subject3 FemalePatientImagingsiteThree ​23

And so on

Thank you!

Best wishes,

Hanna

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