Hello. Thanks for your reply. I have checked out the Medx manual on this
issue but am not entirely clear on it. My understanding is that I need to
create a waveform file by going to Functional and then Correlational
Anaylsis...It appears that I should also create an Input File indicating
the values of my covariate of interest and enter it in either the
correlation or regression box, depending on which I want to do. I am not
sure how to go about creating this Input File. I was wondering if perhaps
you have a tutorial that I could run through that might help me understand
it better?
Thanks.
Rita Rossi
On Tue, 19 Jun 2001, Raj Jagannathan wrote:
> Hi Rita,
>
> Looks like you are using SPM96 in MEDx3.3.
>
> You could do what you want by creating a custom waveform comprising your
> covariate values and then using this waveform in your design. You would need
> to use User Defined for Response Type under the Data, Design and Numbers
> Tab.
>
> Regards....Raj
>
> *********************************************
> Raj Jagannathan
> Medical Products Division
> Sensor Systems, Inc.
> http://medx.sensor.com
>
>
> *********************************************
>
> ----- Original Message -----
> From: "Rita" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, June 14, 2001 1:55 PM
> Subject: Analysing a covariate of interest in an fMRI study using SPM in
> Medx
>
>
> > In the SPM statistics modules in Medx, when analysing FMRI data, it
> appears
> > that a person can only enter confounds, but not covariates of interest. I
> > have a situation in which I would like to look at the effect of a
> > performance measure on fMRI activation across subjects. How would I go
> > about doing this? Is this possible?
> > Thank you.
> > Sincerely,
> > Rita Rossi
> >
>
>
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