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Re: st: RE: ln1=0 for missing values


From   fatma bircan <bircan@metu.edu.tr>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: ln1=0 for missing values
Date   Fri, 23 Apr 2004 13:31:14 +0300

Woul you mind sending me a coppy of the book you suggested. I can not
find it in Turkey I guess.


-----------------
>fatma bircan wrote:
>> For example in a Tobit model if we make a log transformation of the
>> expenditures (dep. var.) some values of the dep. var. will have
>> missing values since they were originally equal to zero. But
assuming
>> that the zero exp. =1 and then taling the log of expenditures, we
can
>> estimate the tobit model. Is this OK for having extra grouns? 
>
>i suggest you read chapter 16 of:
>
>http://mitpress.mit.edu/wooldridge-EconAnalysis
>
>it explains very clearly the issues, and how you should properly 
>calculate partial effects in corner solution models like yours
>
>
>*
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>
Fatma Bircan
Middle East Technical University
Department of Economics
210-2032



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