The two covariates (in theory) will account for some of the variance by
themselves. You could get some bias if you don't includ ethem
On 05/03/2018 03:33 PM, David S Lee wrote:
>
>
> Dear Douglas,
> Thank you for your guidance.
> I am following-up on your response with regards to setting up
External Email - Use Caution
Dear Douglas,
Thank you for your guidance.
I am following-up on your response with regards to setting up DODS
matrix to test interaction between two continous covariates. If I
understand your recommendation correctly (please correct me if I am
