In memoriam Eckart Pankoke (24.6.1939–14.7.2007)

Ohne Zusammenfassung     

Conditional Studentized Survival Tests for Randomly Censored Models

It is shown that in the case of heterogenous censoring distributions Studentized survival tests can be carried out as conditional permutation tests given the order statistics and their censoring status. The result is based on a conditional central limit theorem for permutation statistics. It holds for linear test statistics as well as for sup-statistics. The procedure works under one of the following general circumstances for the two-sample problem: the unbalanced sample size case, highly censored data, certain non-convergent weight functions or under alternatives. For instance, the two-sample log rank test can be carried out asymptotically as a conditional test if the relative amount of uncensored observations vanishes asymptotically as long as the number of uncensored observations becomes infinite. Similar results hold whenever the sample sizes and are unbalanced in the sense that and hold.     

The Glass Screen

This paper seeks to contribute to an ongoing discussion of those social relations that are mediated entirely through computer networks. It begins by pointing to the problems associated with the slippery binary of embodiment and disembodiment, and reminds the reader of the non-material relational and semiotic significance of the body. This non-material relational and semiotic mode of being is also available to us through electronic information and communications media, however, it is asserted that these electronic mediations are of a different kind to those which are face to face, and it is argued that they orient us to the lifeworld in particular ways. The metaphors 'glass', 'screen' and 'monitor' are used to explore the orientation offered by electronic mediation.     

The Equity and Poverty Impacts of Aquaculture: Insights from the Philippines

Recent literature is sceptical about the ability of aquaculture development to enhance equity and reduce poverty. This article investigates the issue empirically by surveying 148 households randomly selected in five coastal communities of the Philippines. There is overwhelming evidence that aquaculture benefits the poor in important ways and that it is perceived very positively by poor and non‐poor alike. In particular, the poor derive a relatively larger share of their income from it than the rich, and a lowering of the poverty line only reinforces this result. A Gini decomposition exercise also shows unambiguously that aquaculture represents an inequality‐reducing source of income, providing employment to a large number of unskilled workers in communities characterised by large labour surpluses.     

Animal Abuse as Dirty Play

Animal abuse by children is generally regarded as an impulsive psychological act without instrumental benefit. This research takes a sociological approach to the topic, exploring the deliberate harm of animals as a particular kind of unsavory or dirty play that is part of adolescent socialization. Interviews were conducted with twenty‐five college undergraduate students who admitted to abusing animals earlier in their lives. Respondents considered their prior acts a form of everyday play having serious and thrilling overtones. At a deeper level, their abuse was an extraordinary form of play in that they also were appropriating adult culture. Because their appropriations stemmed from a wider culture racked with inconsistencies about the proper treatment of animals, respondents' presentations of self were split between those who no longer spoke of abuse as fun and admonished themselves for having done this and those who still clung to the idea that harming animals was fun and were seemingly untroubled by their former acts.     

The Market Response to the Sioux City DC-10 Crash

The 1989 DC-10 crash at Sioux City, Iowa presented a rare instance in which a potential threat to safety was both (i) intensely publicized over a short period and (ii) also amenable to the unobtrusive measurement of the market reaction it evoked. As such, it allowed a useful case study of the extent and duration of behavior change caused by a frightening event. Using reservations data from travel agencies in five states, this paper estimates the short-term effects of the Sioux City crash on passenger willingness to fly the DC-10. The data suggest that, in the first few weeks after the crash, more than one third of travelers who would normally have booked DC-10 flights chose instead to fly other aircraft. Within 2 months of the disaster, however, DC-10 bookings rebounded to within 10% of the level that would have been expected had the Sioux City crash not occurred. At no time, apparently, did the airlines that operate DC-10s use their "yield-management" computer pricing systems unofficially to lower DC-10 fares relative to those on other types of plane.     

On some properties of bivariate weighted distributions

Let X^w and Y^w be weighted random variables arising from the distribution of (X,Y). We explore implications of independence of X and Y on the dependence structure of (X^w, Y^w). We also show that when X and Y are independent and the weight function is symmetric, identical distribution of X^w and Y^w implies that of X and Y. We discuss application of these results to the study of a renewal process.     

Easy Implementation of Writing in Introductory Statistics Courses

In the past decade there has been a substantial increase in the number of introductory statistics courses taught at the undergraduate level. Many have argued successfully for the extensive use of writing in such courses in an attempt to highlight the interdisciplinary role of statistics and acknowledge that a good statistician must also be good at summarizing his or her analyses to nonstatisticians. This point was made by Radke-Sharpe, who went on to add that incorporating writing demands time, energy, and creativity, but that it is usually well worth the effort. This article discusses the efforts made by the authors to include writing in their courses, and some of the techniques that made the writing process painless and productive for both students and faculty.