Hi Tim, sorry, just getting back to this. Can you repost with the rest
of the email chain?
On 8/24/17 12:21 PM, Timothy Hendrickson wrote:
Hi Doug,
Yes thank you this was my contrast matrix, not my design matrix. I've
taken your advice by multiplying the co-variates together.
Thanks for
Hi Doug,
Yes thank you this was my contrast matrix, not my design matrix. I've taken
your advice by multiplying the co-variates together.
Thanks for the help!
-Tim
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Is that your design matrix or the contrast matrix? To test for the
interaction between two continuous variables, one usually creates a new
variable by multiplying them together and then just testing for the
regressor for that variable being different than zero
On 08/23/2017 12:34 PM, Timothy
Freesurfer experts,
I have created a design matrix in order to test for whether there is an
interaction effect between two continuous co-variates controlling for a
categorical variable.
So I have one categorical variable with two levels, and two continuous
co-variates.
My design matrix is as
