Semiparametric inference for survival models with step process covariates

The authors consider Bayesian methods for fitting three semiparametric survival models, incorporating time‐dependent covariates that are step functions. In particular, these are models due to Cox [Cox ( 1972 ) Journal of the Royal Statistical Society, Series B, 34, 187–208], Prentice & Kalbfleisch and Cox & Oakes [Cox & Oakes ( 1984 ) Analysis of Survival Data, Chapman and Hall, London]. The model due to Prentice & Kalbfleisch [Prentice & Kalbfleisch ( 1979 ) Biometrics, 35, 25–39], which has seen very limited use, is given particular consideration. The prior for the baseline distribution in each model is taken to be a mixture of Polya trees and posterior inference is obtained through standard Markov chain Monte Carlo methods. They demonstrate the implementation and comparison of these three models on the celebrated Stanford heart transplant data and the study of the timing of cerebral edema diagnosis during emergency room treatment of diabetic ketoacidosis in children. An important feature of their overall discussion is the comparison of semi‐parametric families, and ultimate criterion based selection of a family within the context of a given data set. The Canadian Journal of Statistics 37: 60–79; © 2009 Statistical Society of Canada     

The delusion of intrapreneurship

The purpose of this article is to provide some insight into the limitations in the concept of intrapreneurship, the definition of an ’intrapreneur‘ being an entrepreneur operating within a large comany rather than in his own business. The author believes that intrapreneurship is not a formula for successful innovation in large companies as a bureaucratic system cannot provide the rewards and the personal autonomy which the true entrepreneur requires.     

Ethical issues in fundraising

The Ethics of Asking: Dilemmas in Higher Education Fund Raising, edited by Deni Elliott. Baltimore: Johns Hopkins University Press, 1995. 236 pp., $29.95 cloth. Ethics for Fundraisers, by Albert Anderson. Bloomington: Indiana University Press, 1996. 150 pp., $29.95 cloth, $12.95 paper.     

Certainty Broadcasts Risk Preferences: Verbal and Nonverbal Cues to Risk-Taking

People often attempt to ascertain how risky another person is willing to be. Even when this information is not purposely divulged, people may unwittingly broadcast their willingness to take risks by displaying cues to their level of certainty. Because subjective reports of feeling certain predict risk behavior, we examined whether targets’ certainty could be discerned unobtrusively and be used to predict their risky decision-making. In small groups, participants discussed two risk problems, made risk decisions, and then wrote an essay about their decision-making process. Participants’ nonverbal behavior and speech content during the group interaction, and their subsequent essay content were assessed by naïve coders and objective word-count software for cues to certainty. Subjective assessments of nonverbal behavior and objective assessments of language content revealed that certainty cues predicted greater risk propensity. Therefore, across the three communication modalities of nonverbal behavior, speech, and text, more certainty cues revealed risky behavior.