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Re: st: xtgee for skewed data

From   Austin Nichols <>
Subject   Re: st: xtgee for skewed data
Date   Thu, 25 Aug 2011 10:23:03 -0400

José Maria Pacheco de Souza <>:
Yes--see the third paragraph on page 5 of the presentation referenced
at the end of the blog post:

2011/8/25 José Maria Pacheco de Souza <>:
> Em 25/08/2011 08:15, Nick Cox escreveu:
>> The discussion started by William Gould at
>> seems relevant. You have a massive spike in the distribution. No
>> transformation will much affect that, as by Murphy's theorem a spike
>> maps to a spike, and in any case there would be the usual argument
>> about what to do with zeros. However, (importantly different here)
> .....
> Dear Statalisters:
> I am not sure whether I can include this question in the thread above, but
> the subjet is related. If the interest is to run a linear regression  of a
> continuous variable as the response, say level of beta carothen, and for
> very small values the results are zero because the equipment can only show
> values equal or greater than .04, the use of -tobit- can be an statistical
> alternative?
> Let´s assume there is no money to buy a better device.
> Best regards,
> josé maria

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