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Re: st: graph interaction in count models

From   Maarten buis <>
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)

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
*--------------------- end example ------------------
(For more on examples I sent to the Statalist see: )

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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