共查询到19条相似文献,搜索用时 82 毫秒
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设随机变量X服从指数分布f(x,θ).研究并给出了指数分布平均寿命参数和平均失效率参数的具有一致最小平均长度的区间估计,计算方法和数值用表. 相似文献
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王志祥 《数学的实践与认识》2009,39(19)
研究了随机右截尾情形下两个指数分布的参数估计.在两个指数分布的刻度参数都未知时,得到了两个指数分布的刻度参数的最大似然估计与参数比的区间估计. 相似文献
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设随机变量X服从指数分布f(x,θ),研究并给出了指数分布平均寿命参数和平均失效率参数的具有一致最小平均长度的区间估计,计算方法和数值用表。 相似文献
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两均匀分布总体参数之比的估计 总被引:1,自引:0,他引:1
给出了两均匀分布的最大次序统计量的密度函数,并讨论了两均匀分布参数之比的通常区间估计、最短区间估计及假设检验方法.最后,根据实例求出了这两种区间估计及其区间长度,并得出了相应的结论. 相似文献
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指数模型步进应力加速寿命试验的区间估计 总被引:5,自引:0,他引:5
本文对寿命分布为指数分布的情形,对逆幂律模型,由步进应力加速寿命试验所获得的数据,给出了逆幂律型中未加参数的区间估计,从而可得到在实际应用所需的加速系数的区间估计。 相似文献
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寻找统计分布中参数的最短置信区间长度往往不容易,一些文献往往讨论具体分布中参数的最短置信区间长度.本文从常用枢轴变量的形式即参数的线性函数形式和反比例函数形式出发,可以获得得到参数最短置信区间长度的两个条件,并且枢轴变量的密度函数满足一定条件时,最短置信区间长度是存在且唯一的,结论具有一般性. 相似文献
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G.R. Jahanshahloo F. Hosseinzadeh LotfiM. Rostamy Malkhalifeh M. Ahadzadeh Namin 《Applied Mathematical Modelling》2009
Data envelopment analysis (DEA) is a method to estimate the relative efficiency of decision-making units (DMUs) performing similar tasks in a production system that consumes multiple inputs to produce multiple outputs. So far, a number of DEA models with interval data have been developed. The CCR model with interval data, the BCC model with interval data and the FDH model with interval data are well known as basic DEA models with interval data. In this study, we suggest a model with interval data called interval generalized DEA (IGDEA) model, which can treat the stated basic DEA models with interval data in a unified way. In addition, by establishing the theoretical properties of the relationships among the IGDEA model and those DEA models with interval data, we prove that the IGDEA model makes it possible to calculate the efficiency of DMUs incorporating various preference structures of decision makers. 相似文献
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Crisp comparison matrices lead to crisp weight vectors being generated. Accordingly, an interval comparison matrix should give an interval weight estimate. In this paper, a goal programming (GP) method is proposed to obtain interval weights from an interval comparison matrix, which can be either consistent or inconsistent. The interval weights are assumed to be normalized and can be derived from a GP model at a time. The proposed GP method is also applicable to crisp comparison matrices. Comparisons with an interval regression analysis method are also made. Three numerical examples including a multiple criteria decision-making (MCDM) problem with a hierarchical structure are examined to show the potential applications of the proposed GP method. 相似文献
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区间数据均值的经验似然估计 总被引:1,自引:0,他引:1
本文提出了估计区间数据均值的经验似然方法,通过构造区间数据的无偏转换,导出了渐近服从χ2分布的对数经验似然函数,从而得到了均值的置信区间.通过若干模拟例子说明,用本文提出的方法得到的估计,优于用渐近正态法得到的估计. 相似文献
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Many real problems can be modelled as robust shortest path problems on interval digraphs, where intervals represent uncertainty about real costs and a robust path is not too far from the shortest path for each possible configuration of the arc costs.A branch and bound algorithm for this problem is presented. 相似文献
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The use of interval mathematics to solve non-linear problems is an attractive alternative to traditional real-number techniques. It was demonstrated in a previous paper [Stradi, B., Haven, E., 2005. Optimal investment strategy via interval arithmetic. International Journal of Theoretical and Applied Finance 8(2), 185–205] that interval arithmetic in the form of the Interval-Newton Generalized Bisection (IN/GB) method is effective in solving highly non-linear problems. In this paper we solve a rational expectations models with the help of the IN/GB method. This method is capable of (i) rapidly eliminating no solution sections of the multidimensional space and (ii) concentrate computational efforts on those areas of multidimensional space where there may be a solution. 相似文献
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区间二次规划在确定模糊评价因素权向量中的应用 总被引:1,自引:0,他引:1
利用区间二次规划方法确定模糊综合评判中评价因素的模糊权向量,它的原理是:以区间的概念为基础。利用区问相离度公式计算使主观偏好值与客观偏好值的总差距最小的权向量就是所求的评价因素的模糊权向量。 相似文献