I am having a problem with the both the ivreg2 and the ranktest stata program code. I am currently using stata 12.0 and the problem is that when I run the code on from a do file stata gives me a r(3000) error message and informs me that "struct ms_vcvorthog undefined", under the subheading "LIML" of the code.
I would appreciate thoughts on what could be causing this problem and suggestions on how one could go about resolving it?
Regards
Michael Ndlovu
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