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st: negative variance after gb2fit


From   Lucia Latino <Latino@economia.uniroma2.it>
To   statalist@hsphsun2.harvard.edu
Subject   st: negative variance after gb2fit
Date   Mon, 02 Jul 2012 13:11:17 +0200

Dear statalist,

I tried to fit data on household food consumption to a generalized beta of second kind using 'gb2fit' command.

gb2fit dec, stats cdf(gb2cdf) pdf(gb2pdf) svy

I obtained a negative variance. How is it possible? What does it tell me?

If it is useful, notice that the sample was drawn using a two-stage stratified sampling procedure which I took into account by svyset my data.
I hope you can help me.

Thank you very much

Lucia


--
*********************************
Lucia Rita Latino
PhD International Economics
Department of Economics
University of Rome "Tor Vergata"
Via Columbia, 2 - 00133 Roma
Latino@Economia.uniroma2.it

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