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RE: AW: st: graph interaction in count models
From
Rodolphe Desbordes <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
RE: AW: st: graph interaction in count models
Date
Thu, 1 Apr 2010 16:35:19 +0100
Dali,
Are you looking at the impact on predicted "probabilities" or on predicted "values"?
Rodolphe
PS: I think that what I suggested in an earlier answer could fit your needs...
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Martin Weiss
Sent: jeudi 1 avril 2010 16:17
To: [email protected]
Subject: AW: AW: st: graph interaction in count models
<>
" I am using STATA 10."
Mind the FAQ, then... Also, the recent
http://www.stata.com/statalist/archive/2010-04/msg00022.html
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von D Ma
Gesendet: Donnerstag, 1. April 2010 17:10
An: [email protected]
Betreff: Re: AW: st: graph interaction in count models
Thanks, Martin. I am using STATA 10.
Dali
----- Original Message ----
From: Martin Weiss <[email protected]>
To: [email protected]
Sent: Thu, April 1, 2010 10:38:09 AM
Subject: AW: st: graph interaction in count models
<>
"(I also don't know why there were question marks ?? in your codes)"
Those would be wildcards, denoting one character each. See [U], sect.
11.4.1.
Which -version- of Stata do you use?
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von D Ma
Gesendet: Donnerstag, 1. April 2010 16:35
An: [email protected]
Betreff: Re: st: graph interaction in count models
Hi Maarten,
Thanks for the advice. It looks like STATA cannot finish the programming
when it involves things like c.grade or c.tenure##c (I also don't know why
there were question marks ?? in your codes). Could you please resend,
possibly in a format like .pdf? In addition, suppose x2 moderates the
effect of x1 on y, I am looking the the differences of the predicted
probabilities in three scenarios: (1) -1 SD(x2), mean(x2), and +1 SD(x2).
Thanks!
Best regards,
Dali
----- Original Message ----
From: Maarten buis <[email protected]>
To: [email protected]
Sent: Thu, April 1, 2010 4:12:05 AM
Subject: Re: st: graph interaction in count models
--- 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
--------------------------
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