Flexible generalized t-link models for binary response data |
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Professor Ming-Hui Chen Date: June 25th 2008(Wed) 3:30pm-4:30pm Location: Key Laboratory of Data Engineering and Knowledge Engineering (Lecture Hall) Abstract A critical issue in modelling binary response data is the choice of the links.We introduce a new link based on the generalized t-distribution. There are two parameters in the generalized t-link: one parameter purely controls the heaviness of the tails of the link and the second parameter controls the scale of the link. Two major advantages are offered by the generalized t-links. First, a symmetric generalized t-link with an unknown shape parameter is much more identifiable than a Student t-link with unknown degrees of freedom and a known scale parameter. Secondly, skewed generalized t-links with both unknown shape and scale parameters provide much more flexible and improved skewed link regression models than the existing skewed links.Various theoretical properties and attractive features of the proposed links are examined and explored in details.An efficient Markov chain Monte Carlo algorithm is developed for sampling from the posterior distribution. The Deviance Information Criteria measure is used for guiding the choice of links. The proposed methodology is motivated and illustrated by prostate cancer data. Biography of the speaker
from Purdue University. He is now a full professor at Department of Statistics, University of Connecticut. He was elected as a Fellow of the Institute of Mathematical Statistics in 2007. and a Fellow of the American Statistical Association in 2005. He was elected as an ordinary member of the International Statistical Institute (ISI)in 1999.He received the Harold J. Gay Professorship in Mathematical 2000.Sciences from WPI, 1998-2000, and the I.W. Burr Award in 2001. Statistics from Purdue University in 1993. He is also members 2002.of many professional societies, including Institute of 2003.Mathematical Statistics, American Statistical Association; ENAR, 2004.The International Biometric Society; Section on Bayesian 2005.Statistics; International Chinese Statisticians Association; and 2006.The International Statistical Institute. (联系人:龙永红,62515245) |
Dr. Ming-Hui Chen got his
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