Hello,

I am trying to set female nonathlete as the base group in my regression:

regress colgpa hsize hsizesq hsperc sat femath maleath malenoath

where Array Array


I ran regress colgpa hsize hsizesq hsperc sat ib0.femath maleath malenoath where I tried setting femath = 0 as the base group because of nonathlete. However, I still got an output with note: maleath omitted because of collinearity.
How do I fix this problem?

Thanks,
Rayne