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

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


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.

R-help@stat.math.ethz.ch mailing list
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Received on Fri Jan 19 03:22:08 2007

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Thu 18 Jan 2007 - 17:30:26 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.