共查询到15条相似文献,搜索用时 15 毫秒
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《Serials Review》1988,14(4):75-76
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《Serials Review》1987,13(1):49-50
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M. H. Poursaeed 《Statistical Papers》2010,51(2):409-419
In the study of the reliability of technical systems, k-out-of-n systems play an important role. In the present paper, we consider a (n − k + 1)-out-of-n system consisting of n identical components such that the lifetimes of components are independent and have a common distribution function F. It is assumed that the number of monitoring is l and the total number of failures of the components at time t
i
is m
i
, i = 1, . . . , l − 1. Also at time t
l
(t
1 < . . . < t
l
) the system have failed or the system is still working. Under these conditions, the mean past lifetime, the mean residual
lifetime of system and their properties are investigated. 相似文献
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William Bell 《商业与经济统计学杂志》2013,31(3):383-387
Two general models for monthly seasonal time series are considered, one in which seasonality is modeled with monthly means and another in which seasonality is modeled with a (0, 1, 1)12 ARIMA structure. The models are shown to be equivalent if the seasonal moving average parameter (?) is 1 and if the same assumptions about the 12 initial observations are made for both models. The role of the assumptions about the initial observations is analyzed, and it is argued that for practical purposes the two models can be regarded as equivalent when ? = 1. It is observed that the result extends easily to more general models involving overdifferencing. 相似文献
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AStA Advances in Statistical Analysis - In the Corona pandemic, it became clear with burning clarity how much good quality statistics are needed, and at the same time how unsuccessful we are at... 相似文献
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