I have the following problem.
DV is binomial p
IV is quantitative variable that goes from negative to positive values.
The data look like this (need nonproportional font to view):
o o
o o
o o
o o
o
----------------------+------------------------
0
If these data were symmetrical about zero, I could use abs(IV) and do glm(p
~ absIV).
I suppose I could fit two glms, one to positive and one to negative IV
values. Seems a rather ugly approach.
(To complicate things further, this is within-subjects design)
Any suggestions welcome. Thanks!
Bill
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