If they want you to just regress the within-group effect of duration, then:
- demean the set of disease ages
- pad with zeros for the non-disease subjects.
Cheers.
> Hi All,
>
> Sorry to post this again and again. We are in the review process on a
> manuscript so it will be great help to me if someone could clarify the
> following for me. The reviewer has asked us to regress out the effect of
> disease duration since I don't have disuration measure for controls how to
> do this can I leave those cells in my design matrix empty. I tried using
> NAN and 0 both didn't work.
>
>
> Thanks
> Venkat
>
>
>
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