[R] The math underlying the `betareg' package?

From: Ajay Narottam Shah <ajayshah_at_mayin.org>
Date: Thu 18 Jan 2007 - 14:30:55 GMT


Folks,

The betareg package appears to be polished and works well. But I would like to look at the exact formulas for the underlying model being estimated, the likelihood function, etc. E.g. if one has to compute \frac{\partial E(y)}{\partial x_i}, this requires careful calculations through these formulas. I read "Regression analysis of variates observed on (0,1): percentages, proportions and fractions", by Kieschnick & MucCullogh, `Statistical Modelling" 2003, 3:193-213. They say that the beta regression that they show is a proposal of theirs - is this the same as what betareg does, or is this the Standard Formulation?

What else should I be reading about beta regressions? :-)

-- 
Ajay Shah                                      http://www.mayin.org/ajayshah  
ajayshah_at_mayin.org                             http://ajayshahblog.blogspot.com
<*(:-? - wizard who doesn't know the answer.

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Received on Fri Jan 19 03:22:08 2007

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