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The relative performance of a component of a series system in two different environments is considered. The conditional probability of the failure of the system due to the failure of the specified component given that the system failed before time t is regarded as a measure of relative importance of the component to the system. A U-statistic test for checking the equality of the relative importance of the component to the system in two different environments against the alternative that the relative importance is smaller in one of the environments, is proposed. Some simulation results for estimating the power of the test are reported. The proposed test is applied to one real data set and it is seen that a different aspect of the data is brought out by this comparison than that by the comparisons of the absolute importance functions such as the subsurvival functions, considered in earlier studies. 相似文献
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Elizabeth George Claudio Milman Satish P. Deshpande 《International Journal of Value-Based Management》1999,12(2):129-136
This study examines perception of various business practices of Russian and American managers. Using data collected from 136
Russian managers and 252 American managers we found that cross-national differences account for many differences between perceptions
of business practices. Implications for managerial practice are discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Here we have obtained a non-parametric test for testing the null hypothesis H0 that the given realization is from a Markov process against the alternative hypothesis H1 that it is from a semi-Markov process with the transition rate monotone increasing (or decreasing). We have shown that the test criterion has normal distribution asymptotically, and the test is consistent and unbiased. 相似文献
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The competing risks data consist of a pair (T,δ) where T≧0 can be interpreted as the failure time and δ as the identifier of the risk causing the failure. In many practical situations, the main interest lies in studying the inter-relationships between the probability structures of the failure time under various risks. Here, we consider two risks and propose the Junctional relationships between the probability structure of (T,δ=1) and (T,δ=2) by time-dependent scale and shape shifts. Also, a model which raptures the relative aging of a unit under the two risks is proposed. The necessary theory for confidence estimation of these shift functions is developed. These techniques are illustrated through several data sets available in the literature. 相似文献
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The main characteristic of a load sharing system is that after the failure of one component the surviving components have to shoulder extra load and hence are prone to failure at an earlier time than what is expected under the original model. In others, the failure of one component may release extra resources to the survivors, thus delaying the system failure. In this paper we consider such m component systems and some observation schemes and identifiability issues under them. Then we construct a general semiparametric multivariate family of distributions which explicitly models this phenomenon through proportional conditional hazards. We suggest estimates for the constant of proportionality. We propose a nonparametric test for the hypothesis that the failures take place independently according to the common distribution against the alternative hypothesis that the second failure takes place earlier than warranted, study its properties and illustrate its use. 相似文献
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The determinants of intent to unionize were investigated using the responses of 405 employees of a large public university,
243 of whom were members of an employee association. Members and nonmembers indicated significantly different levels of union
vote intent, general beliefs, specific beliefs, and normative pressures. They also used a different union vote decision model.
General beliefs about unions appear to play a significantly greater role in unionization decision of nonmembers. On the other
hand, while considering unionization, specific beliefs about unions were significantly more important for association members.
Association members were less likely to vote for unionization. 相似文献
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