Hi,
I am trying to do a regression analyses using the functional data as DV
and three questionnaire measures as predictors. Since, the EV's are not
demeaned at the higher level of analyses, I mean centered (EV value - mean
of EV) the EV's beforehand. I then included an EV consisting of 1's
(modeling group mean) and three mean centered EV's corresponding to the
three predictors in the model. I get an error message stating "at least
one EV is a linear combination of other..." I do not get this error if I
include only the three EV's corresponding to the predictors and not the EV
modeling the group mean. It appears that adding the EV modeling the group
mean adds some linear dependency in the model. I am not sure why this is
happening or how to proceed next. I would appreciate any suggestions.
thanks
Appu
|