Not with QDEC, but you can write your own FSGD, See
https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples
Xie, Hong wrote:
Hello,
Thank you for answering me. I searched mailing list and read this
answer email:
/I see that group.levels has four levels. Unfortunately, right now
qdec only supports two levels for a discrete factor. One the features
in the works is to increase this./
/Nick Schmansky
Wed, 27 Feb 2008 11:08:10 -0800/
Is this question still here? I have a five levels discrete factor. Can
I run correlation statistic by Qdec?
Thanks again
Hong Xie
------------------------------------------------------------------------
*From:* Douglas N Greve [mailto:gr...@nmr.mgh.harvard.edu]
*Sent:* Thu 1/8/2009 4:40 PM
*To:* Xie, Hong
*Cc:* freesurfer@nmr.mgh.harvard.edu
*Subject:* Re: [Freesurfer] Qdec correlation analyses
It has to be interpreted as a continuous variable. The test is done
using a t-test inside the glm. This reduces to a Pearson if there is
only one variable and no intercept (which it is not).
doug
Xie, Hong wrote:
>
> Hello, freesurfer group,
>
>
>
> I have run qdec for comparing thickness between two groups. When qdec
> does a correlation analyses for thickness versus a second variable: 1)
> Does the second variable have to be a continuous interval variable or
> 2) can the second variable be an ordinal variable with more than 2
> levels? In the case of the correlation between two continuous
> variable, is the test a Pearson correlation? If 2) is possible, is the
> correlation a Spearman correlation?
>
> Thank for your help,
>
>
>
> Hong Xie
>
> ------------------------------------------------------------------------
>
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> Freesurfer@nmr.mgh.harvard.edu
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