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| From | Yuval Arbel <yuval.arbel@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: How to use tobit where the low bounds are not fixed for each observation? |
| Date | Thu, 3 Nov 2011 00:08:20 +0200 |
Austin, thanks for the advice which seems very helpful. I understand from your answer that -intreg- works properly only if the residuals are normally distributed. Am I correct?.Maybe I can check for normality after I run the model? anyway, the sample is big and includes 15,000 observations, but about 10,000 of them are censored. Also the question is: does -intreg- addresses the problem of selection bias? in addition to the fact that the winning bids are censored (in cases nobody had bought the offered land), I suspect there is higher probability to arrange land auctions without minimum price in the periphery rather the core areas where land is more expensive. I wonder what is your opinion on this matter? On Wed, Nov 2, 2011 at 11:31 PM, Austin Nichols <austinnichols@gmail.com> wrote: > Yuval Arbel <yuval.arbel@gmail.com>: > Start with -help intreg- but are you willing to assume a particular > distribution (normal)? > > On Wed, Nov 2, 2011 at 4:01 PM, Yuval Arbel <yuval.arbel@gmail.com> wrote: >> Dear Statalist Participants, >> >> I am working on land-auction data. The lands are allocated for >> apartment construction or single family units. My question refers to >> the following two groups: >> >> 1. Land auctions with minimum prices (low bounds) where land was >> eventually sold >> 2. Land auctions with minimum prices (low bounds) where land was not >> sold (this is the largest group) >> >> I have two questions: >> >> 1. Is there any available stata command to run a tobit model where the >> low bounds are not fixed? Is there any other procedure for >> left-censored data? >> 2. Is there any possibility to run the first proceudure with the >> heckman correction? > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Dr. Yuval Arbel School of Business Carmel Academic Center 4 Shaar Palmer Street, Haifa, Israel e-mail: yuval.arbel@gmail.com * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/