برمال زن, قباد
گروه آمار، دانشگاه زابل
[ 1 ] - مقایسه تصادفی سیستمهای سری و موازی در مدل مقیاس
In this paper, series and parallel systems, when the lifetimes of their components following the scale model are studied and different stochastic orderings between them are discussed. Moreover, we apply these results to the series and parallel systems consisting of exponentiated Weibull or generalized gamma components. The presented results in this paper complete and extend some known results in …
[ 2 ] - مقایسه های تصادفی فواصل نمونه ای آماره های مرتب از متغیرهای مستقل نمایی
Suppose there are two groups of independent exponential random variables, where the first group has different hazard rates and the second group has common hazard rate. In this paper, the various stochastic orderings between their sample spacings have studied and introduced some necessary and sufficient conditions to equivalence of these stochastic ordering. Also, for the special case of sample si…
[ 3 ] - Model Confidence Set Based on Kullback-Leibler Divergence Distance
Consider the problem of estimating true density, h(.) based upon a random sample X1,…, Xn. In general, h(.)is approximated using an appropriate in some sense, see below) model fƟ(x). This article using Vuong's (1989) test along with a collection of k(> 2) non-nested models constructs a set of appropriate models, say model confidence set, for unknown model h(.).Application of such confidence set h…
[ 4 ] - مقایسههای تصادفی سیستمهای سری و موازی متشکل از مولفههای لوماکس با مفصل ارشمیدسی
در این مقاله به مطالعه ترتیبهای تصادفی معمولی، ستاره و محدب انتقالیافته از سیستمهای سری و موازی با مولفههای ناهمگن و وابسته پرداخته میشود. شرایط کافی برای برقراری ترتیب تصادفی ستاره بین سیستمهای سری و موازی با مولفههای وابسته لوماکس با چند دورافتاده اثبات شده است. همچنین نشان داده است بدون هیچگونه محدودیتی روی پارامترها، طول عمر سیستمهای سری یا موازی با مولفههای همگن کوچکتر از مولفهها…
[ 5 ] - Ageing Orders of Series-Parallel and Parallel-Series Systems with Independent Subsystems Consisting of Dependent Components
In this paper, we consider series-parallel and parallel-series systems with independent subsystems consisting of dependent homogeneous components whose joint lifetimes are modeled by an Archimedean copula. Then, by considering two such systems with different numbers of components within each subsystem, we establish hazard rate and reversed hazard rate orderings between the two system lifetimes, a…
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