共查询到19条相似文献,搜索用时 93 毫秒
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本文研究强混合样本下随机设计情形线性模型的经验似然推断,将分块技术应用到经验似然方法中,证明了线性模型的参数β的对数经验似然比统计量的渐近分布为卡方分布,由此构造了强混合样本下β的经验似然置信区间.在有限样本情况下给出数值模拟结果. 相似文献
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在加权线性损失下导出了刻度指数族中参数单调的Bayes检验函数,利用同分布负相协(NA)样本情形概率密度函数及其导数的核估计构造了经验Bayes(EB)检验函数,获得了EB检验函数的收敛速度.在适当的条件下,这一收敛速度可任意接近O(n~(-1)),改进了文献中已有的结果.对同分布正相协(PA)样本和独立同分布(iid)样本情形,亦可获得类似结论.最后给出了一个满足文中主要结果的例子. 相似文献
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《数学的实践与认识》2018,(21)
针对弹药试验数据样本量少时无法直接采用经典统计学方法的问题,介绍了弹药贮存可靠度评估的传统方法和现有自助扩容方法,并针对其不足提出了改进自助扩容算法,增加了自助样本量信息、保证了抽样样本与原始样本特征的一致性、降低了异常值的影响,并对所提算法利用Matlab软件仿真验证.结果表明,所提算法能有效进行贮存可靠度评估,具有显著优越性.该结论可用于弹药小样本数据贮存可靠度评估,为弹药贮存管理提供理论支撑. 相似文献
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特征筛选方法是处理超高维数据的一种快速有效的降维方法.针对超高维判别分类数据,提出一种改进的超高维特征筛选方法,方法不需要特定的模型假定;可以处理多分类响应变量情形;可适用于离散型或连续型协变量情形;对服从重尾分布的协变量,方法仍具有较好的稳健性.从理论上证明了所提出特征筛选方法满足确定筛选性和指标排序相合性,并通过数值模拟和实例分析在有限样本条件下验证了方法的有效性. 相似文献
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发汗冷却系统的控制及其特性* 总被引:5,自引:1,他引:4
本文给出热层三维发汗冷却控制系统的数学模型.在一般情形下,它是一个可变域上分布参数和集中参数混合的非线性控制系统.本文指出:在冷却剂渗流是一维不可压缩的(或一维定常的)条件下,热层的传热和烧蚀问题可以单独求解.针对热防护层的表面烧蚀问题,本文讨论了系统控制方案,阐明简化的条件,研究了一维发汗冷却系统点控制的特性,给出了冷却剂无相变和有相变两种情形的平衡状态解. 相似文献
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在定数截尾样本下三参数威布尔分布的矩估计 总被引:5,自引:0,他引:5
本文讨论了在定数截尾样本下三参数威布尔分布的矩估计问题.在定数截尾情形下,将威布尔分布数据转化为均匀分布数据,利用平均剩余寿命构造样本矩,同时,第三阶矩方程用样本的第一个次序统计量来代替,得到了在定数截尾样本下三参数威布尔分布的矩估计方程,用随机模拟方法得出了矩估计的偏性和均方误差.并与近似MLE进行了比较,表明此矩估计方法有较好的性质. 相似文献
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asymptotic normality of the joint distribution of sample quantiles is investigated when the number of sample quantiles increases
as the sample size increases. This paper aims at a refinement of the original results by Ikeda and Matsunawa [3]. 相似文献
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应用Bayes统计方法进行武器射程的评定,可以有效减少试验的样本量,节省试验弹药,Bayes方法的关键是确定先验分布,均匀分布是比较容易确定的一种先验分布,该文给出了基于均匀先验分布武器射程评定的Bayes方法,对改进射程的评定方法,减少试验用弹量,具有重要作用. 相似文献
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D. Malchiodi 《Nonlinear Analysis: Hybrid Systems》2008,2(2):635-647
Learning algorithms consider a sample consisting of pairs (pattern, label) and output a decision rule, possibly: (i) associating each pattern with the corresponding label, and (ii) generalizing to new patterns drawn from the same distribution of the original sample. This work proposes a set of methodologies to be applied to existing learning strategies in order to deal with more complex kinds of data sets, carrying also a quantitative measure on the quality of each label. 相似文献
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Ulf Torstensson 《International Journal of Mathematical Education in Science & Technology》2013,44(4):363-365
In normal samples, the sample variance and sample mean are independent random variables, and the sample variance has, when properly normalized, a X2‐distribution. This paper gives elementary proofs by induction for these two facts. 相似文献
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[1]中给出了样本容量n已知的(n,r)定时截尾不完全样本的分析方法。在[2]中我们讨论了n未知的(n,r)定时截尾不完全样本并较好地处理了晚截尾的接近完全样本的分析。本文中我们相应于截尾样本,引入截尾分布,通过用截尾样本拟合截尾分布而得到寿命T的整体分布。此方法无论对n已知还是n未知,对早截尾还是晚截尾的(n,r)定时截尾样本都适用。并且此方法还可推广到对其它形式的不完全样本的处理。 相似文献
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A new and very fast method of bootstrap for sampling without replacement from a finite population is proposed. This method can be used to estimate the variance in sampling with unequal inclusion probabilities and does not require artificial populations or utilization of bootstrap weights. The bootstrap samples are directly selected from the original sample. The bootstrap procedure contains two steps: in the first step, units are selected once with Poisson sampling using the same inclusion probabilities as the original design. In the second step, amongst the non-selected units, half of the units are randomly selected twice. This procedure enables us to efficiently estimate the variance. A set of simulations show the advantages of this new resampling method. 相似文献
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M.M. Mohie El-Din Y. Abdel-Aty A.R. Shafay 《Journal of the Egyptian Mathematical Society》2011,19(3):102-105
In this paper, two sample Bayesian prediction intervals for order statistics (OS) are obtained. This prediction is based on a certain class of the inverse exponential-type distributions using a right censored sample. A general class of prior density functions is used and the predictive cumulative function is obtained in the two samples case. The class of the inverse exponential-type distributions includes several important distributions such the inverse Weibull distribution, the inverse Burr distribution, the loglogistic distribution, the inverse Pareto distribution and the inverse paralogistic distribution. Special cases of the inverse Weibull model such as the inverse exponential model and the inverse Rayleigh model are considered. 相似文献
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The conventional method for testing hypotheses is to find an exact or asymptotic distributionof a test statistic But when the model is complex and the sample size is small,difficulty often arises. Thispaper aims to present a method for finding maximum probability with the help of EM algorithm. For any fixedsample size,this method can be used not only to obtain an accurate test but also to check the real level of 相似文献