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- R Duncan Luce, Drs, Young-Hee Cho, Enrico Diecidue, George Karabatsos, A A J Marley +5 others
- 2009

An outline is given of the behavioral properties (axioms) that have been proposed, and to some extent empirically evaluated, concerning uncertain (often risky) alternatives, the joint receipt of alternatives, and possible linking properties. Recent theoretical work has established the existence of three inherently distinct risk types of people—risk seeking,… (More)

In the framework of dichotomous response data, this study develops Markov Chain Monte Carlo estimation theory for an item response model that estimates the answer key, in addition to respondent competence (ability), response bias, and item difficulty parameters. This model unifies ideas of test theory and latent structure analysis, as the estimated… (More)

- Robert D Gibbons, Eisuke Segawa, George Karabatsos, Anup K Amatya, Dulal K Bhaumik, C Hendricks Brown +4 others
- Statistics in medicine
- 2008

A new statistical methodology is developed for the analysis of spontaneous adverse event (AE) reports from post-marketing drug surveillance data. The method involves both empirical Bayes (EB) and fully Bayes estimation of rate multipliers for each drug within a class of drugs, for a particular AE, based on a mixed-effects Poisson regression model. Both… (More)

- George Karabatsos, Elizabeth Talbott, Stephen G Walker
- Research synthesis methods
- 2015

In a meta-analysis, it is important to specify a model that adequately describes the effect-size distribution of the underlying population of studies. The conventional normal fixed-effect and normal random-effects models assume a normal effect-size population distribution, conditionally on parameters and covariates. For estimating the mean overall effect… (More)

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