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Re: st: How can I manually generate predicted values without using -predict- , in a logit regression?


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How can I manually generate predicted values without using -predict- , in a logit regression?
Date   Fri, 21 Mar 2008 22:55:19 +0000 (GMT)

--- Jn <ensam21@gmail.com> wrote:
> I am running a simple logit regression after which I got my predicted
> value via -predict- command.
> 
> I was wondering if there was a way I can manually generate my
> predicted y-value without using Stata's -predict-.
> 
> I first tried generating a linear prediction (xb) (instead of default
> pr), then attempted exp(xb)/(1+exp(xb)) but this didn't work.

The example below works for me:

*----------- begin example -----------
sysuse auto, clear
logit foreign mpg
predict pr, pr
predict xb, xb
gen pr2 = exp(xb)/(1+exp(xb))
twoway scatter pr pr2, aspect(1)
*----------- 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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