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Re: st: predict at observed values


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: predict at observed values
Date   Sun, 6 May 2007 22:29:02 +0100 (BST)

--- anjum@mail.utexas.edu wrote:
> I am trying to get predicted values for caries2 (my dep var) at
> observed values of all exogenous var except seals. I can get
> predicted values for caries at mean of exogenous variables using 
> prvalue commands but do not know how to get it at observed values for
> each observation. I want to see how the prediction for caries2
> changes if everyone gets sealants (seals=1) while their other
> variables are at observed values. I ran the following code from an
> example by Scott Long somewhere online. I get the following error
> message "i: operator invalid." Can anyone please help by having a
> look at the following code and tell me where I am wrong? All my vars
> are binary except c_age which is continuous.

I don't think your code came through to the list, and you are not very
specific about where you found the code, but this example works:

*-------------- begin example ----------------
sysuse auto, clear
recode rep78 1/3=0 4/5 = 1
logit rep78 price mpg foreign

tempvar temp
gen `temp' = foreign

replace foreign = 1
predict pr1, pr
replace foreign = 0
predict pr0, pr

replace foreign = `temp'
predict pr, pr

sum pr0 pr1 pr
*---------------- end example ----------------
(For more on how to use examples I sent to the Statalist, see:
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


		
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