yes, that works too
On 02/24/2014 11:20 AM, Yang, Daniel wrote:
> Thanks, Doug. I will standardize the age first.
>
> I can also think of another way of doing this: divide the sample into
> 4 age bins and treat age as a Discrete Factor with 4 levels.
>
> Best,
> Daniel
>
> --
> Daniel (Yung-Jui)
Yes, though you might want to demean age before computing the quadratic.
doug
On 02/24/2014 10:13 AM, Yang, Daniel wrote:
> Hi FreeSurfer Experts,
>
> With age as a continuous variable, qdec can test the linear effect of
> age. To test the quadratic effect of age, do I just create a
> curviline
