Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

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


From   Edwin Leuven <e.leuven@uva.nl>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: ln1=0 for missing values
Date   Wed, 21 Apr 2004 15:10:21 +0200

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


*
* 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/




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index