The efficacy of beta and gamma emitters in reducing clinical and angiographic restenosis in patients with in-stent restenosis has been confirmed by a number of studies. This review is intended to give an overview of the individual trials, summarize pertinent lessons that have been learned and give insight into the future of intracoronary radiation. The encouraging results from the clinical tria...

Item response theory (IRT) was used to investigate whether this method could be applied to measure HRD effectiveness. Attention was given to handling missing data, interpretation of IRT-scores, and comparison with a comprehensive model for explaining HRD effectiveness. An acceptable fit was shown. The IRT method provided much information about the performance of HRD programs with respect to com...

The article provides an overview of goodness-of-fit assessment methods for item response theory (IRT) models. It is now possible to obtain accurate p-values of the overall fit of the model if bivariate information statistics are used. Several alternative approaches are described. As the validity of inferences drawn on the fitted model depends on the magnitude of the misfit, if the model is reje...

OBJECTIVE The primary purpose of this experiment was to gain a greater understanding of the utilization of working memory when interacting with a speech-enabled interactive voice response (IVR) system. BACKGROUND A widely promoted guideline advises limiting IVR menus to five or fewer items because of constraints of the human memory system, commonly citing Miller's (1956) paper. The authors ar...

Drawing on longitudinal data from the Early Childhood Longitudinal Study, Kindergarten Class of 1998– 1999, this study used IRT modeling to operationalize a measure of parental educational investments based on Lareau’s notion of concerted cultivation. It used multilevel piecewise growth models regressing children’s math and reading achievement from entry into kindergarten through the third grad...

We examined Myers-Briggs Type Indicator (MBTI) score distributions computed using itemresponse theory (IRT) to assess the generalizability of earlier bimodality reports which have been cited in support of the “type” versus “trait” view of personality. Using the BILOG IRT program to score a sample of approximately 12,000 individuals who participated in leadership development programs, θ score di...

Interest in end-of-year accountability exams has increased dramatically since the passing of the NCLB law in 2001. With this increased interest comes a desire to use student data collected throughout the year to estimate student proficiency and predict how well they will perform on end-of-year exams. In this paper we use student performance on the Assistment System, an on-line mathematics tutor...

Dichotomous IRT models can be viewed as families of stochastically ordered distributions of responses to test items. This paper explores several properties of such distributions. More in particular, it is examined under what conditions stochastic order in families of conditional distributions is transferred to their inverse distributions, from two families of related distributions to a third fa...

This paper applies the techniques of Item Response Theory (IRT) to data from the Statistics Concept Inventory (SCI). Based on results from the Fall 2005 post-test (n = 422 students), the analyses of IRT are compared with those of Classical Test Theory (CTT). The concepts are extended to discussions of other applications, such as computerized adaptive testing and Likertscale items which may be o...

How energy moves around the vibrational modes of a polyatomic molecule, such as benzene, is of considerable interest, both spectroscop-ically and theoretically. Much eeort has been devoted to observing and understanding how energy is transferred out of initially excited overtone states involving the CH stretching modes. Signiicantly less study has been devoted to an understanding of how and on ...