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st: negative variance after gb2fit
From
Lucia Latino <[email protected]>
To
[email protected]
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
[email protected]
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