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From | daniel56061-stata@yahoo.de |
To | statalist@hsphsun2.harvard.edu |
Subject | st: Strange Behaviour When Selecting Levels For Factor Variables In Regression With i# |
Date | Fri, 18 Jan 2013 23:45:16 +0000 (GMT) |
Hello, when i use indicator i with selecting level of a factor variable like i1.varname to run a regression I get strange results. For example: sysuse blong,clear regress bp i.sex i.when c.patient i.when#c.patient regress bp i1.sex i.when c.patient i.when#c.patient regress bp i0.sex i.when c.patient i.when#c.patient This regression is wihout sense but theoretically it should estimate the same model and should give same results except for variable sex cause all I do is demand an indicator for a different level of a 2-level variable sex. But if I run these lines I get three regressions with three different coefficients for the variable "when" and "patient" even I didnt change anything that should be related to these variables. Whats wrong here? regards Daniel * * 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/