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Re: st: predicting fitted values after ivtobit


From   Alejandro Delafuente <alejandro.delafuente@sant.ox.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: predicting fitted values after ivtobit
Date   Wed, 06 Feb 2008 09:42:34 +0000

My mistake Maarten, the example below was not meant to include z in the foreach 
loop. 

Alejandro
In message <176394.25566.qm@web25011.mail.ukl.yahoo.com> 
statalist@hsphsun2.harvard.edu writes:
> --- Maarten wrote:
> > > Leave z as is, and manually replace all other variables with their
> > > mean, than predict, than plot predicted value against z.
> 
> --- Alejandro Delafuente <alejandro.delafuente@sant.ox.ac.uk> wrote:
> > Thanks Maarten, is this what you are suggesting then:
> > 
> > ivtobit remittance a b (z = d e), ll(0) first
> > 
> > foreach x in a b z {
> >         sum `x' if e(sample)
> >         gen `x'_bis = `x'
> >         replace `x' = r(mean)
> >        }
> > predict remittance_predict, e(0,.) 
> > twoway (scatter z_predict z, sort
> 
> No, leave z as is, means do NOT change it, i.e. it should NOT be part
> of your -foreach- loop. I suggest you first run the example below as is
> discussed here http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html#work
> and than adapt it one step at a time to your problem.
> 
> Hope this helps,
> Maarten
> 
> *------------------ begin example --------------------
> webuse laborsup, clear
> ivtobit fem_inc fem_educ kids (other_inc=male_educ), ll
> 
> // Notice that other_inc is NOT included
> foreach var in fem_educ kids {
> 	sum `var' if e(sample), meanonly
> 	clonevar t`var' = `var'
> 	replace `var' = r(mean)
> }
> 
> predict fem_inc_hat, ystar(10,.)
> twoway line fem_inc_hat other_inc, sort
> 
> // return fem_educ and kids to their original values
> foreach var in fem_educ kids {
> 	replace `var' = t`var'
> 	drop t`var'
> }
> compress
> *------------------- 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 )
> 
> 
> -----------------------------------------
> 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/
> -----------------------------------------
> 
> 
>       __________________________________________________________
> Sent from Yahoo! Mail - a smarter inbox http://uk.mail.yahoo.com
> 
> *
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-- 
Alejandro de la Fuente
Department of International Development/QEH
University of Oxford, Mansfield Road, Oxford OX1 3TB
Tel: 01865 281836

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