caused by mammographic screening. Lancet 1994;343:979. 2 Van den Akker-van Marle ME, Reep-van den Bergh CM, Boer R, Del Moral A, Ascunce N, de Koning HJ. Breast cancer screening in Navarra: interpretation of a high detection rate at the first screening round and low rate at the second screening round. Int J Cancer 1997;73:464-9. 3 Health Council of the Netherlands. The benefit of population scr...

One approach to evaluating the strength of association between a longitudinal marker process and a key clinical event time is through predictive regression methods such as a time-dependent covariate hazard model. For example, a Cox model with time-varying covariates specifies the instantaneous risk of the event as a function of the time-varying marker and additional covariates. In this manuscri...

I think there is much to like and agree with in Etzioni’s argument. And while he provides a wealth of specific examples, this is the first real utopias proposal that offers a general societal framework, rather than a specific proposal. This leads one to speculate on how well other proposals would fit within the communitarian agenda. Clearly, activities that promote civic engagement, like delibe...

Experimental trials of programs are sometimes aborted when resource bounds are exceeded. The data from these trials are called censored data. This paper discusses the inferences that can be drawn from samples that include censored data. A key component of statistical inference, the sampling distribution, is generally not known for censored samples. However, the bootstrap procedure has been appl...

Das Web 2.0 ist u.a. auch eine weltweite Plattform für Meinungsäußerungen. Immer mehr Kunden diskutieren online über Produkte und tauschen Erfahrungen aus. Die Analyse der Online Beiträge stellt daher ein wichtiges Marktforschungsinstrument dar. Es wird ein Ansatz zur automatischen Identifikation, Aggregation und Analyse von Meinungen mittels Text Mining vorgestellt und dessen Anwendung an eine...

The purpose of this study was to analyze a five-week graduate-level education course taught entirely at a distance via the Internet using the Blackboard.comSM e-learning system, with emphasis on exploring the dynamics of sense of classroom community. Subjects were 20 adult learners, evenly divided between males and females, who were administered the sense of classroom community index at the beg...

Although most people believe that planners that delay step-ordering decisions as long as possible are more e cient than those that manipulate totally ordered sequences of actions, this intuition has received little formal justi cation or empirical validation. In this paper we do both, characterizing the types of domains that o er performance di erentiation and the features that distinguish the ...

Social capital creates local economic prosperity. This ® nding by Putnam (1993a), Fukuyama (1995), Coleman (1988, 1990) and other social scientists has lent legitimacy to what those involved in community economic development have known intuitively for years: the level of inter-personal trust, civic engagement and organisational capability in a community counts. Their research indicates that the...

To build e ective planning systems, it is crucial to nd the right level of representation: too impoverished, and important actions or goals are impossible to express; too expressive, and planning becomes intractable. Under the classical framework, Pednault [17] provided a happy compromise between the impoverished strips representation, and the expensive situation calculus. Among languages handl...

Minerva aims to quickly extract relationship tuples of the form 〈object, relationship, object〉 from large corpora such that they can later be explored by a user or data-mining program. A custom noun-phrase chunker allows the system to identify candidate relationships. These candidates are then either accepted or rejected by a classifier trained using manually-labeled relationships. Minerva was ...