Dear Experts,
we want to compare data (thickness) of 4 groups (3 morbid groups and 1 controll group). Both, Qdec and mri_glmfit, will do the same analyses. But we are not sure, if the usage of Qdec is statistically correct in our case. Because in Qdec we can only compare 2 of the 4 groups. But Qdec is much more comfortable to handle. Or do you advise the mri_glmfit for our data analyses?
Thanks for some advice! Sandy Schramm
yes, use mri_glmfit doug
On 10/26/15 3:34 AM, Sandy Schramm wrote:
Dear Experts,
we want to compare data (thickness) of 4 groups (3 morbid groups and 1 controll group). Both, Qdec and mri_glmfit, will do the same analyses. But we are not sure, if the usage of Qdec is statistically correct in our case. Because in Qdec we can only compare 2 of the 4 groups. But Qdec is much more comfortable to handle. Or do you advise the mri_glmfit for our data analyses?
Thanks for some advice! Sandy Schramm _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
If QDEC gives you that contrast, then it is the same. QDEC is a bit clunky when it comes to correctly for multiple comparisons, but it should give the same answer as mri_glmfit doug
On 10/28/2015 04:23 AM, Sandy Schramm wrote:
Dear Doug, thanks for reply. But isn't it statistically the same: compare e.g. the thickness of morbid group 1 with the controll group via Qdec respectively compare both groups via contrasts (e.g. 1 0 0 -1) in mri_glmfit? For me the only advantage of mri_glmfit is to controll for more variables/covariates. Are there more advantages? Kind regards Sandy *Gesendet:* Dienstag, 27. Oktober 2015 um 16:27 Uhr *Von:* "Douglas Greve" greve@nmr.mgh.harvard.edu *An:* freesurfer@nmr.mgh.harvard.edu *Betreff:* Re: [Freesurfer] comparison of 4 groups: mri_glmfit or Qdec? yes, use mri_glmfit doug
On 10/26/15 3:34 AM, Sandy Schramm wrote:
Dear Experts,
we want to compare data (thickness) of 4 groups (3 morbid groups and 1 controll group). Both, Qdec and mri_glmfit, will do the same analyses. But we are not sure, if the usage of Qdec is statistically correct in our case. Because in Qdec we can only compare 2 of the 4 groups. But Qdec is much more comfortable to handle. Or do you advise the mri_glmfit for our data analyses?
Thanks for some advice! Sandy Schramm _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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