Hani M. Samawi

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A diagnostic cut-off point of a biomarker measurement is needed for classifying a random subject to be either diseased or healthy. However, the cut-off point is usually unknown and needs to be estimated by some optimization criteria. One important criterion is the Youden index, which has been widely adopted in practice. The Youden index, which is defined as(More)
The effects of trifluoperazine on the toxicity and mutagenicity of bleomycin were examined in cultured human lymphocytes. Lymphocyte cultures were initiated from three adult healthy non-smoking male volunteers. Cultures were exposed to the drugs for either three or twenty hours prior to cell collection. The toxic and clastogenic effects of the different(More)
The purpose of this paper is to investigate the hypothesis that outdoor daily walking, as an exercise, has an effect on the rate of mortality among those elderly people in the Iowa 65+ Rural Health Study (RHS). RHS is a prospective longitudinal cohort study of 8 years follow-up from 1981 to 1989. It consists of a random sample of 3,673 individuals (1,420(More)
In this paper we consider three measures of overlap, namelyMatusia’s measure ρ, Morisita’s measure λ and Weitzman’s measure∆. These measures are usually used in quantitative ecology and stress-strength models of reliability analysis. Herein we consider two Weibull distributions having the same shape parameter and different scale parameters. This(More)
This chapter explores the concept of using ranked simulated sampling approach (RSIS) to improve the well-known Monte-Carlo methods, introduced by Samawi (1999), and extended to steady-state ranked simulated sampling (SRSIS) by Al-Saleh and Samawi (2000). Both simulation sampling approaches are then extended to multivariate ranked simulated sampling (MVRSIS)(More)