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| From | "Yu Chen, PhD" <profyuchen@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: Equivalent variables but different results |
| Date | Thu, 11 Jul 2013 21:46:17 +0800 |
Dear Statalist, I ran the following code, and made sure that dd is equivalent to c.length#i1.foreign, and foreign is equivalent to i1.foreign by using the list command. However, when I put the variables into regressions, I got very different results. I want to know why this happened. Thank you. sysuse auto , clear gen dd=length*foreign list foreign i1.foreign dd c.length#i1.foreign reg mpg dd foreign reg mpg c.length#i1.foreign i1.foreign * * 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/