About once a year we get an email like this saying that there are inconsistent results between SPSS and mri_glmfit. I think the problem usually boils down to having a different design matrix. Can you extract the design matrix from SPSS and compare it to Xg.dat? Or can you import Xg.dat and use it to analyze in SPSS? Or do something else to validate that they are using the same model?

On 3/23/19 11:55 PM, Yali Jiang wrote:

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Dear all,

I was asked to provide a power calculation of my group comparison results on cortical thickness, so I extracted all clusters with significance in CT into SPSS. but I found the cluster value of CT is not significant in SPSS based on group comparison. so I got a very small effect size although the original ROI was generated by a initial threshold of p < 0.001, and corrected by monte-carlo p < 0.05, two sided.

Is this possible? how can I resolve it?

best,

Yali
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