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From | Maarten buis <maartenbuis@yahoo.co.uk> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: graph interaction in count models |
Date | Thu, 1 Apr 2010 01:12:05 -0700 (PDT) |
--- On Wed, 31/3/10, D Ma wrote: > I am trying to graph an interaction between two continuous > covariates in a count model (xtgee y x1 x2 x1*x2 ..., > family(nb) link(log) vce(robust) nolog). Do you have > any suggestions as to how draw such a graph? Thanks! *------------------ begin example -------------------- webuse nlswork, clear xtset idcode year gen black = race == 2 if inlist(race, 1, 2) xtgee wks_work c.tenure##c.grade south black, /// family(nb) link(log) preserve replace south = 0 replace black = 0 keep if e(sample) bys grade: keep if _n == 1 expand 5 drop tenure bys grade: gen tenure = (_n -1)*5 predict wks_hat separate wks_hat, by(tenure) twoway line wks_hat? wks_hat?? grade, sort restore *--------------------- end example ------------------ (For more on examples I sent to the Statalist see: http://www.maartenbuis.nl/example_faq ) Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/