共查询到20条相似文献,搜索用时 46 毫秒
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This article presents a nonparametric Bayesian procedure for estimating a survival curve in a proportional hazard model when some of the data are censored on the left and some are censored on the right. The method works under the assumption that there is a Dirichlet process prior knowledge on the observable variable. Strong consistency of the estimator is proved and an example is given. To finish some simulation is presented to analyze the estimator. 相似文献
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知识解码(四)生命进化知识解码(续) 总被引:1,自引:0,他引:1
进化论证据 进化论的科学及统计上的证据,主要有下列几项。 第一、遗传与突变:遗传学告诉我们生物的基因是固定的,可历代相传,经过无数次的细胞分裂而不改变。但这固定却不是完全绝对的,偶然间某些基因会突然发生改变,成为与原来不同的新基因,因而产生与亲代略异的个体,并将它遗传给下一代。这种变化称为突变,不但在自然界中可以发生,在实验室也可经由刺激(光、紫外线、或其他化学物品的作用)引发,此为进化论最重要的证据。近来遗传学的研究日新月异,探究的理论有族群遗传学、基因流变、重组、适应性及变异性等,统计在遗传学… 相似文献
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现有对中国居民收入性别差异的研究都是基于个人收入样本数据,进行收入差异均值分解和歧视定量研究。指数基准问题是横亘其中一道绕不过去的坎。本文基于人们对其收入是否合理进行主观评价的指标,来选择指数基准以深入研究城镇居民收入的性别差异。本文的计算结果显示,按照经典的Blinder-Oaxaca模型和Cotton模型计算,收入的性别歧视被大大低估。 相似文献
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我国信用卡业务的迅猛发展助推了消费经济的快速发展,但信用卡的逾期行为不容忽视。收入代表了一个人的经济地位,是信用卡按时还款的保障。本文基于某商业银行信用卡客户的逾期数据,以持卡人的经济地位为视角,分析了经济地位对信用卡逾期行为的影响。研究结果表明,我国商业银行信用卡持卡人的逾期行为具有显著的经济特征,收入对信用卡逾期的影响呈“U”型的非线性特征,即收入较低和收入较高的持卡人逾期的可能性较高,收入处于中间的持卡人逾期的可能性较低。进一步的研究发现,中年群体、工作单位稳定者、有房者会降低经济地位对信用卡逾期行为的非线性影响,而账龄较长的持卡人提升了这种影响。本文的研究为全社会建立良好的信用卡用卡环境,商业银行高效处理信用卡逾期,改进和完善商业银行信用卡风险管理提供了关键证据。 相似文献
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Many recent articles have identified behavioral disturbances in vector autoregressions by imposing restrictions on the long-run effects of shocks. This article demonstrates that this approach will be unreliable unless the underlying economy satisfies three types of strong restrictions. Although many aspects of these issues have been raised before, this article draws out and illustrates the implications for inferences under the long-run scheme. Furthermore, it provides strategies for dealing with the problems. 相似文献
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Ravindra Khattree 《统计学通讯:理论与方法》2013,42(1):263-274
In this paper, estimates QP dispersion matrix and its functions are compared based on generalized Pitman nearness criterion, Various Iosa functions are considered for the purpose. Locally superior estimates are defined and obtained. Comparison of these estimates are made with other standard ones. It is snown that within certain classes, defined in the paper, these are the best estimatcrs ia the generalized Fitman nearness sense 相似文献
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Byron J. T. Morgan 《Journal of applied statistics》1983,10(2):158-166
With the ready availability of computer graphics packages, it is now straightforward to produce isometric projections of three-dimensional surfaces. The usefulness of such projections is shown by means of a number of examples. Illustrating likelihood surfaces and bivariate density functions. 相似文献