Hi Donald,
do you mean:
enter your three covariates: age, gender (1s and -1s), and age*gender
Form the age*gender outside of SPM by mulitplying age*gender(1s and -1s)
otherwise you'll lose the information of one half of the subjects, is'nt it?
Michael
Am 05.03.2012 20:19, schrieb MCLAREN, Donald:
> In SPM, choose multiple-regression
> enter your three covariates: age, gender (1s and 0s), and age*gender
>
> Form the age*gender outside of SPM by mulitplying age*gender(1s and 0s)
>
> Best Regards, Donald McLaren
> =================
> D.G. McLaren, Ph.D.
> Postdoctoral Research Fellow, GRECC, Bedford VA
> Research Fellow, Department of Neurology, Massachusetts General Hospital
> and
> Harvard Medical School
> Website: http://www.martinos.org/~mclaren
> <http://www.martinos.org/%7Emclaren>
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> On Mon, Mar 5, 2012 at 4:24 AM, Qizhu Wu <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> Dear all,
>
> I am analyzing structural images of a cohort normal subjects. I have
> examined the gender differences and the correlation with age.
> Now I am trying to explore the interaction between gender and age
> effects on brain structure. I was advised to use the linear model:
> Y = beta0+beta1*age+beta2*gender+beta3*(age*gender);
> Could anyone pls tell me how can I set this model in SPM?
>
> Best wishes
> Qizhu Wu
> West China Hospital
>
>
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Dr. Michael Erb
Dep. Neuroimaging and MR-Physics
University Hospital Tübingen
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