DPABI/DPABISurf/DPARSF

Hi Yan,

An error occured when I am performing mixed effect analysis using DPABI.  There are 2 groups of subjects (19 control and 19 patient) in my data and each group underwent 2 fMRI scan in 2 different times.  I chose grey matter density as covariate images and FD as txt covariates. Should I perform ANCOVA (repeat) or mixed effect analysis to see the difference between the two groups and within two patient conditions? How do I perform post-hoc analysis after mixed effect analysis since there is no post hoc analysis to cho0se in mixed effect analysis? 

Dear Chao-Gan,

Recently I have done a study which includes two datasets (30 patients and 30 controls, and 20 patients and 21 controls, respectively), and the second is the subset of the first. The reviewer required me to report the globle correlation between these two contrasts. However, I have never done such analysis before. Can I use dpabi or any other software to achieve it?

Best,

Vincent 

Hi,

I was wondering if it is possible with DPABI to check the quality of the coregistration somehow? I could only find pictures for checking the quality of the Normalization.

greetings

David

Dear experts.

I am looking for csf and white matter signal covariates and find the attached file in ...globalCovs folder.

However, the file contained 30 columns and perhaps the last three columns would be meaningful to me.

Please let me know which comumn represents csf, white matter, and global signal.

Best regards,

tetsuya

Dear Chaogan,

My study is to use voxel-based rs-FC measure to perform statistical analysis. That rs-FC measure was generated within a GM mask, so that FC was calculated between any two voxels within the GM.

After statistical analysis,  however, I consider that the whole brain mask, instead of the GM mask, should be used for smoothness estimation (FWHMx,y,z) with 4D residuals.

Dear experts,

I used Gissian random field (GRF) in DPABI  for multiple correction when comparing rs FC maps differences between patient groups.

Dear Dr Yan

         I have several problem which confuse me .

         1. How to set the thr in the image caclator. I gonna set a mask use the expression, (i1<thr)+(i2<thr). I have no idea about the definition of thr. I had ever used the number of Voxels(alpha sim correction) and thr in Viewer. But it doesn't work.

        2.It confuse me that there are many noises in the blank region. 

Dear Dr.Yan,

May I ask a simple but sounds stupid question? I know it should do reho before smoothing, but is it possible that calculate alff before smoothing as well? Why?

best

fish

Dear experts

In a statistcal analysis of DPABI, a default setting of mixed effect analysis is 2X2. 

What if I want to use mixed effect analysis of DPABI with factors greater than 2? 

Best, Dong Woo 

Dear DPARSFA list,

I am wondering how I can run DPARSFA with sun grid engine (SGE). Our server does not allow to run parallel processing so I was wondering if you could give advice on how I can run DPARSFA with SGE. 

Many thanks for your help.

Best wishes,