bubbles in asset prices have fascinated researchers in finance. identify asset bubbles, by circumstances, on the stock market has been a growing number of research theoretical and empirical. on a theoretical level, it was assumed that the price dynamics reflect irrational behavior of economic agents and, therefore, should be excluded from a deal with the truly rational economic agents burmeiste...

In this article, the failure rates of the system's components are functions of time t. We study two cases (i) the mixture of two stages of life time distribution with Weibull failure rates, (ii) the mixture of two stages failure rates with Weibull distribution. The reliability equivalence factors of some systems with identical components are obtained. Two different methods are used to improve t...

electric power industry have always try to provide reliable electricity to customers and at the same time decrease system costs. high voltage circuit-breakers are an essential part of the power network. this study has developed a maintenance and replacement scheduling model for high voltage circuit- breakers that minimize maintenance costs while maintaining the acceptable reliability. this mode...

A two-component survival mixture model is proposed to analyse a set of ischaemic stroke-specific mortality data. The survival experience of stroke patients after index stroke may be described by a subpopulation of patients in the acute condition and another subpopulation of patients in the chronic phase. To adjust for the inherent correlation of observations due to random hospital effects, a mi...

Dalam kertas ini, prestasi ralat piawai bootstrap bagi anggaran berpemberat MM (WMM) dibandingkan dengan ralat piawai Monte Carlo dan ralat piawai Berasimptot. Sifat-sifat selang keyakinan bootstrap bagi anggaran berpemberat WMM seperti 'Percentile' (PB), 'Bias-corrected Percentile' (BCP), 'Bias and Accelerated' (BC.), 'Studentzed Percentile' (SPB) dan 'Symmetric' (SB) te1ah diperiksa dan diban...