How to add covariates in Mixed Effect Analysis?

Submitted by megan on Tue, 06/26/2018 - 10:01

Dear Dr. Yan,

I encountered a problem while doing Mixed Effect Analysis. I wanted to add covariates (age, gender and handness). But the problem is that the covariates are the same for both condition 1 and condition 2.

I added as

group1_cov.txt

group1_cov.txt

group2_cov.txt

group2_cov.txt

Then Dpabi ran for hours and gave weired results. I also tried to name the covariates differently but it didn't work either. I wonder what is the proper way to add covariates in Mixed Effect Analysis. 

Thank you!

Best Regards,

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DPARSF error using copyfile

Submitted by spl on Tue, 06/26/2018 - 08:11
严博士，您好：
                   不好意思打扰您，我是来自郑州大学的一名研究生，最近在学习DPARSF对fMRI数据进行预处理时遇到问题，在查找资料无果后，故此写这封求助信向您求助，望您在百忙之中能够抽空帮忙解答疑问。具体问题如下：

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how to extract ALFF value of ROIs

Submitted by mitaomian on Mon, 06/25/2018 - 01:53

Dear Yan,

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dparsf预处理出错，非常紧急，求老师们帮看看

Submitted by keke on Sun, 06/24/2018 - 17:20
 
Error in DPARSFA_run>(parfor body) (line 274)
        if strcmpi(DirDCM(3).name,'.DS_Store')  %110908 YAN Chao-Gan, for MAC OS compatablie
 
Error in parallel_function (line 466)
            F(base, limit);
 
Error in DPARSFA_run (line 270)
    parfor i=1:AutoDataProcessParameter.SubjectNum
 
Error in DPARSFA>pushbuttonRun_Callback (line 1786)

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GraphVar_2.01 GLM panel

Submitted by Yuki on Wed, 06/20/2018 - 08:50

Hello!

I read GraphVar_SPSS_GLM_validation and GraphVar_Manual but I don,t know GLM panel.

Could you explain me the difference between them(between covariate,nuisance covariate,within covariate)?

All the best,

Yuki

 

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Group gray matter density mask

Submitted by Peace on Sat, 06/16/2018 - 02:18

Dear Experts

I would like to genearate a group GM mask by using DPABI's quality control module.

In my understandings, I could generate a GroupMask90Percent.nii based on wAutomask, and then thresholding the mask.

  1. How to create a group specific GM mask by using QC module?

In addition, all images must have the same dimension for statstiscal analysis.

If a group GM mask was generated using SPM Masking toolbox, and then reslicing the mask.

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DPASFA做功能连接时的输出文件

Submitted by PengyuZhang on Wed, 06/13/2018 - 04:23

严老师，您好！

   我在用DPASFA做功能连接时对输出结果有一些疑惑，想跟您询问一下。

   我选取了14个AAL脑区做成一个MultipleLabel的模板，勾选了Functional Connectivity和Extract ROI time course。

   在输出的结果中，FC_FunImgARCWSF文件夹中的SeedSeries和ROISignals_FunImgARCWSF的值不一样。我的理解是SeedSeries和ROISignals应该都是某个脑区信号的时间序列的平均值，请问我的理解对吗，如果不对，那这两个文件实际上对应的是什么值？另外，FC_FunImgARCWSF文件夹中的ROI1FCMap_sub1.nii文件是某个脑区所有体素的信号均值与全脑的连接强度，还是某个脑区的中心坐标的信号与全脑的连接强度？

   期待您的答疑，十分感谢！

 

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Some error in DPABI Tool

Submitted by jLee on Tue, 06/12/2018 - 04:06
 Dear
 
 The following error occured  when preprocessing ADNI data.  
------------------------------------------------------------------------
Running job #1
------------------------------------------------------------------------
Running 'Slice Timing'
 
SPM12: spm_slice_timing (v6130)                    11:45:40 - 12/06/2018
========================================================================

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PALM approaches: PT TFCE

Submitted by Peace on Mon, 06/11/2018 - 15:41

Dear Experts

For PT with TFCE, both FDR & Two-tailed were set.

In my understandings, PT were tested at two-tailed P<0.05 with number of permutations being carried out in the analyses. In addition, FDR & FWE were also examined.

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Concatenate time-series across runs

Submitted by NinaGoossens on Fri, 06/08/2018 - 07:12

Dear experts, 

We performed three separate fMRI runs, during which we applied muscle vibration at 60 Hz and at 20 Hz in blocks of 18s, which were separated by 18s blocks of rest (no vibration). Each block is preceded by a short verbal instruction (3s, 1 scan). By contrasting 60 Hz to 20 Hz vibration, we determine brain activation during proprioceptive processing.

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