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| From | Shikha Sinha <shikha.sinha414@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: OLS and IV have opposite sign |
| Date | Mon, 15 Oct 2012 12:58:09 -0700 |
Dear all, I am estimating an Ordinary least square (OLS) and Instrument variable (IV) model, however the signs are opposite to each other. The OLS coeff is negative, while the IV coeff is positive. Could anyone explain what the signs in these two models are different- is there any econometric reason for this? Thanks, Shikha * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/