[Freesurfer] qdec differences in FS 5.0 vs 5.3

Hi,

I'm learning how to use QDEC and was comparing results that it produces under FresSurfer 5.0 vs 5.3. I know the 5.0 has an option for either DODS or DOSS method of producing a design matrix, while the 5.3 only has DODS. This suggests that results should be identical (or at least similar) across versions if I select DODS. However, I'm getting very different results based on the version I select: complete lack of differences across groups in 5.3 and a predicted pattern of differences in 5.0 using DODS. I'd like to understand where the differences are stemming from -- any ideas?

Thanks in advance! Maria

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Maria Kharitonova, Ph.D. Postdoctoral Research Fellow Laboratories of Cognitive Neuroscience Boston Children's Hospital