Thank you.

Is the following setup looks correct?

We have 1 group of subjects, half came at TP1 & TP2, half came at TP1 & TP3.

And we would like to do a Two Stage longitudinal anaylsis later, is it correct if we

put in the following way?

*GroupDescriptorFile 1 **Title G2V2 *

*Class MaleClass Female* *Variables Age Minutes *

*Input TP1_sub1.long.Template1 Female 26 0*

*Input TP2_sub1.long.Template1 Female 26 1800* *Input TP1_sub2.long.Template2 Male 20 0* *Input TP3_sub2.long.Template2 Male 20 1000*

Thank you

Jahanvi

1. You don't include sex as a covariate. Include it as a class (ie,

Class Male and Class Female rather than Class Main). 2) You need to include Minutes in your null hypothesis. 3) Include minutes as a covariate as you have done, then create the proper contrast matrix. The contrast matrix will depend on the classes you set up

You can also see https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples

On 6/1/16 9:03 AM, jahanvi patel wrote:

• Dear list,

*>>* We have a question about the set up of the FSGD file. *>>>>* We have 1 group, 2 continued covariates (age & mintues), 1 *>* discontinued covariate (sex) *>>>* GroupDescriptorFile 1 *>* Title G1V3 *>* Class Main *>* Variables Age Sex Minutes *>* Input subject1 Main 30 0 1200 *>* Input subject2 Main 40 1 180 *>>>* My question is *>>>* 1) How to enter the column "sex" in FSGD. *>* Can I input 1 for Male and 0 for Female? *>>* 2) What would be the Main Contrast (regress out effect of sex & age)? *>>* (Null Hypothesis: the intercept/offset is different than 0 after *>* regressing out the effects of age and sex) *>>* 3) If I want to correlate the continued variable (minutes) with the *>* Thickness, is it correct in this way ? : *>>* 0 0 0 1 *>>>>* Thanks so much *>>>* Jahanvi *>>>>* _______________________________________________ *>* Freesurfer mailing list *>* Freesurfer at nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer *>* https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer *