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ON PARTIAL ORDERINGS BETWEEN COHERENT SYSTEMS WITH DIFFERENT STRUCTURES

Published online by Cambridge University Press:  10 April 2001

Félix Belzunce
Affiliation:
Departamento Estadística e I.O., Universidad de Murcia, 30100 Murcia, Spain, E-mail: belzunce@um.es
Manuel Franco
Affiliation:
Departamento Estadística e I.O., Universidad de Murcia, 30100 Murcia, Spain, E-mail: mfranco@um.es
José-Maria Ruiz
Affiliation:
Departamento Estadística e I.O., Universidad de Murcia, 30100 Murcia, Spain, E-mail: jmruizgo@um.es
M. Carmen Ruiz
Affiliation:
Departamento Matemática Aplicada y Estadística, Universidad Politécnica de Cartagena, 30203 Murcia, Spain, E-mail: maricarmen.ruiz@upct.es

Abstract

In this article, we give some results on the preservation of orderings between the components under the formation of coherent systems with different structures. We consider the stochastic, failure rate, reversed failure rate, and likelihood ratio orderings to compare two coherent structures formed from a set of components and from two sets of components, in both cases, when components are independent and either identically distributed or not necessarily identically distributed. As a consequence, we get new stochastic comparisons of systems with different k-out-of-n structures, and some results of partial orderings given by other authors may be also obtained from ours.

Type
Research Article
Copyright
© 2001 Cambridge University Press

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