Dear John Fox, Christian Kleiber, and Achim Zeileis,
I am attempting to run various independent variable parameters to assess
their suitability. Unfortunately, I hit a snag and couldn't get the tests
to run properly. When I used ivreg, I got an error message saying: "Error
in eval(predvars, data,
Kelis,
thanks for your interest. It's hard to say what exactly goes wrong based
on the information you provide. However, I would recommend that you first
process the data:
- Store all variables as the appropriate types (numeric, factor, etc.)
in the data frame. Then you don't have to put the
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