# Re: st: Predict Command after zinb

 From anju parthan <[email protected]> To [email protected] Subject Re: st: Predict Command after zinb Date Sat, 12 Mar 2005 08:29:51 -0800 (PST)

```Thanks May and Yulia.

It works:)

Regards
Anju
--- May Boggess <[email protected]> wrote:
> >
> > I am trying to understand how the predict command
> > works after zinb command. I want to know if we can
> use
> > generate command to get the same result as predict
> > command.
> >
>
> Here is an example that shows what -predict- can do
> after -zinb-:
>
>  clear
>  webuse fish
>  drop xb
>  zinb count persons livebait, inf(child camper)
> nolog
>  predict xb1,xb
>  gen myxb1=[count]_b[persons]*persons /*
>  */ +[count]_b[livebait]*livebait+[count]_b[_cons]
>  sum xb1 myxb1
>
>  predict xb2,xb equation(#2)
>  gen myxb2=[inflate]_b[child]*child /*
>   */ +[inflate]_b[camper]*camper+ [inflate]_b[_cons]
>  sum xb2 myxb2
>
>  predict p,p
>  gen myp=exp(xb2)/(1+exp(xb2))
>  sum p myp
>
>  predict n, n
>  gen myn=(1-p)*exp(xb1)
>  sum n myn
>
> My technique for finding out what -predict- is up to
> behinds the scenes
> is to use -set trace on-. Now, a lot of times -set
> trace on- produces
> too much output to search through, but I have found
> that for the
> purposes of finding a -predict- formula, there is
> surprisingly little
> output. Then one can look back through the trace to
> find the generate
> statements that -predict- actually used.
>
> By the way, a nice feature of -set trace on- that I
> have used, is the
> highlight. It highlights a specific word in the
> output making it easier
> to find what you are looking for. Type
>
>  whelp trace
>
> to see the help file for that.
>
> -- May
> [email protected]
>
>
> *
> *   For searches and help try:
> *
> http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>

____________________________________________________________

Anju Parthan,
Doctoral Candidate,
The University of Texas at Austin, PHAR-PHARMACY ADMIN
1 UNIVERSITY STATION A 1930, AUSTIN, TX-78712
Tel: (512) 459-4942; Fax: (512) 471-8762

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