
From  Giorgio Ricchiuti <g.ricchiuti@tiscali.it> 
To  statalist@hsphsun2.harvard.edu 
Subject  Re: st: RE: Zero Trunctated and One inflated Poisson 
Date  Tue, 20 Mar 2007 08:12:56 +0100 
 Giorgio Ricchiuti wrote:I have been modelling the number of affiliates that the firm i has in<snip>
the country j. My data are zerotruncated but unfortunately are even
oneinflated (75% of cases). I did not find any possibility to analyse
this mixmodel in STATA 9.0 (neither using for example zip or ztp). I
worked out the maximum likelihood, and I changed the adofile of zip as
follows:
Of course I also changed gradient and hessian but, unfortunately, I amMost user written ml commands use lf instead of d2 because lf is much easier to program. You can use my ``zero inflated logit'' program I sent to the statalist this morning as a template: http://www.stata.com/statalist/archive/200703/msg00633.html .
not a developer, hence I did some mistake.
Does anyone help me, explaining either how to change the maximum
likelihood correctly or developing the model directly in Stata?
Hope this helps,
Maarten
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