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| From | Lisa Marie Yarnell <lisa.yarnell@utexas.edu> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: xi function dummies being dropped due to collinearity |
| Date | Sat, 25 May 2013 12:34:44 -0700 |
Hello Statalisters: I'm using the xi function to create school dummies to control for school effects in a quantile regression model, using the code below. However, the dummies are all being dropped because of collinearity. Why would this happen, and how can I alleviate this? Thank you, Lisa . xi: sqreg bmiscore ecopct aa hispanic spanish otherl boy bmi_p20 bmi_p50 bmi_p80 i.schoolid if grade == 4, quantile (.5 .6 .7 .8 .9) reps(50) i.schoolid _Ischoolid_1-280 (_Ischoolid_1 for sch~d==003905001 omitted) note: _Ischoolid_2 dropped because of collinearity note: _Ischoolid_4 dropped because of collinearity note: _Ischoolid_5 dropped because of collinearity note: _Ischoolid_8 dropped because of collinearity note: _Ischoolid_10 dropped because of collinearity note: _Ischoolid_11 dropped because of collinearity note: _Ischoolid_13 dropped because of collinearity note: _Ischoolid_14 dropped because of collinearity note: _Ischoolid_17 dropped because of collinearity note: _Ischoolid_20 dropped because of collinearity note: _Ischoolid_21 dropped because of collinearity note: _Ischoolid_22 dropped because of collinearity note: _Ischoolid_23 dropped because of collinearity note: _Ischoolid_24 dropped because of collinearity note: _Ischoolid_25 dropped because of 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dropped because of collinearity note: _Ischoolid_255 dropped because of collinearity note: _Ischoolid_259 dropped because of collinearity note: _Ischoolid_260 dropped because of collinearity note: _Ischoolid_261 dropped because of collinearity note: _Ischoolid_262 dropped because of collinearity note: _Ischoolid_263 dropped because of collinearity note: _Ischoolid_269 dropped because of collinearity note: _Ischoolid_270 dropped because of collinearity note: _Ischoolid_272 dropped because of collinearity note: _Ischoolid_273 dropped because of collinearity note: _Ischoolid_275 dropped because of collinearity note: _Ischoolid_276 dropped because of collinearity note: _Ischoolid_278 dropped because of collinearity note: _Ischoolid_279 dropped because of collinearity (fitting base model) -- Lisa M. Yarnell Department of Psychology University of Southern California 3620 McClintock Ave. Mailroom SGM 501, Office 826B Los Angeles, CA 90089-1061 Mobile, preferred: (617) 548-2893 Office: x0-0850 or (213) 740-0850 Fax: (213) 746-9082 * * 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/