DPABI/DPABISurf/DPARSF

Dear DPABI list,

Hi DPABI experts,

I'd like to perform a statistical analysis, i.e. two-group ttest using the z-transformed functional connectivity maps, and have already done the model estimation.

Now I'm trying to do multiple comparison correction with alphasim and have questions about the procedures.

So I open Viewer from dpabi main menu, import the overlay T2.nii from model estimation, and choose AlphaSim correction for computation. How should I use the output AlphaSim.txt for extraction of significant clusters afterwards?

Dear Mr.Yan,

I have performed resting MRI preprocessing with DPARSF Basic version (e.g., slice timing, realign, normalization, and smooth). However, there were no output flies of smooth, as well as, the file "PicturesForChkNormalization" was empty. Besides, my MatLab is 2010a version (I have tried to reset it and use another computer, yet it did not work). The attachments are parameters I set, the outcomes after preprocessing, and steps of MatLab. Thanks for your help.

Best,

Waymen.

Dear Mr. Yan:

I defined 56 ROIs and get 56 functional connectivity graphs across all subjects by REST. Now I’d like to compare every two graphs so as to find out the similarity of them, that is to get the r values between the two graph. I use the Image Calculator to finish this work, but I have to repeat the same manipulation 56*55/2 times.

Dear Chao-Gan

Hello
Thank you so much for your time. I have read your paper on  GCA and  need your help. After obtaining the path coefficients how could I perform a one sample ttest since I do not know the population mean?
Secondly, what is used to represent the connection strength between areas? t value of the related path coefficients?

Many thanks,
mahsa

Hi,

I am trying to run a correlation analysis using the Statistical Analysis tool.   However, I'm getting the error as below.  Also, do I need to demean the data prior to doing the correlational analysis, or does DPABI do it for me?

Thanks,

Matt

Hello, I am wondering whether DPARSF's realign parameter the same as SPM default parameter or not. 

Your help will be greatly appreciated!

Cherry

Dear Experts,

When runnin the Friston 24 motion regression the text file actually contains 25 columns.  The first column appears to be just values of "1".  Is there any reason for this?  Is the first column ignored when doing the covariate regression?

Jason

Hi, Chao-gan

Hi dpabiers!

Dear Dr. Yan. 

Anyone know why when I perform Friston 24 I get this Warning; 

Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND =  1.205703e-10.