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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