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carprice
2005 Jun 30
2
Finding out collinearity in regression
...contrasts can be applied only to factors with
2 or more levels
I think there is a dependency in explanatory
variables. So, I wanted to use alias to find out a
dependency in design matrix but I can't because I
cannot create "fit" in the first place.
One of examples I found is:
carprice1.lm <- lm(gpm100 ~
Type+Min.Price+Price+Max.Price+Range.Price,data=carprice)
alias(carprice1.lm)
But, what if I can create lm object ? Then is there a
way to find out a dependency in design matrix? Thanks
a lot for help in advance!
-Young.