L一统计量的Edgeworth展开和Bootstrap副近

文［１］讨论了Ｌ一统计量的一种能达到Ｏ（１／ｎ）精确性的Ｂｏｏｔｓｔｒａｐ副近,本文则在适当条件下,证明了上述Ｂｏｏｔｓｔｒａｐａ副近能达到精确性ｏ（１／ｎ）,并给出了Ｌ一统计量的一阶Ｅｄｇｅｗｏｒｔｈ展开的估计．     

L─统计量的Bootstrap逼近

Ｌ─统计量的Ｂｏｏｔｓｔｒａｐ逼近任哲，陈明华（六安师范专科学校，六安２３７０１２）本文提出了Ｌ──统计量的一种Ｂｏｏｔｓｔｒａｐ逼近，并讨论了这种逼近的相合性及其逼近的精确性。一、引言及主要定理设兄，ｉ＞１为来自分布为Ｆ的ｉ．ｉ．ｄ．样本，以Ｘ．；...     

L-统计量的Edgeworth展开和随机加权逼近

文［１］讨论了Ｌ－统计量的一种能达到Ｏ１√ｎ精确度的随机加权逼近,本文则给出了Ｌ－统计量的Ｅｄｇｅｗｏｒｔｈ展开和一种能达到ｏ１√ｎ精确性的新的随机加权逼近     

学生化U—统计量的Edgeworth展开和Bootstrap逼近

本文研究学生化Ｕ－统计量的Ｅｄｇｅｗｏｒｔｈ展开和Ｂｏｏｔｓｔｒａｐ逼近，在核函数ｈ较弱的矩条件下，给出了学生化Ｕ－统计量的一项Ｅｄｇｅｗｏｒｔｈ展开式和Ｂｏｏｔｓｔｒａｐ逼近。     

多种Bootstrap置信限的模拟比较

多种Ｂｏｏｔｓｔｒａｐ置信限的模拟比较范大茵（浙江大学应用数学系）１．问题的提出Ｂｏｏｔｓｔｒａｐ方法是现今统计计算中常用的方法，例如在可靠性计算中常有参数的Ｂｏｏｔ－ｓｔｒａｐ点估计以及Ｂｏｏｔｓｔｒａｐ置信限．根据文献介绍对于求未知参数的Ｂｏｏｔ...     

线性模型L－估计其光滑Bootstrap统计量的一些渐近结构

本文证明了文［２］中Ｌ－估计具有强相合性，重对数律，并给出了它的均方收敛速度．证明了Ｌ－估计的光滑Ｂｏｏｔｓｔｒａｐ统计量有与Ｌ－估计类似的线性渐近展开式，由此展开式我们证明了它的渐近正态性及其光滑Ｂｏｏｔｓｔｒａｐ逼近成立．     

学生化U－统计量的Edgeworth展开和Bootstrap逼近

本文研究学生化Ｕ－统计量的Ｅｄｇｅｗｏｒｔｈ展开和ＢｏｏｔｓｔｒａＰ逼近，在核函数ｈ较弱的矩条件下，给出了学生化Ｕ－统计量的一项Ｅｄｇｅｗｏｒｔｈ展开式和Ｂｏｏｔｓｔｒａｐ逼近．     

具有无界计分函数的L－统计量的Bootstrap逼近

利用经验过程方面的若干事实，本文建立了具有无界计分函数的Ｌ－统计量的Ｂｏｏｔｓｔｒａｐ逼近，取得了较为理想的结果．     

样本均值Bootstrap逼近的收敛速度

本文进一步研究Ｂｏｏｔｓｔｒａｐ逼近的收敛速度，在随机变量的（２＋δ）阶矩（０≤δ＜２）有限的情况下，讨论标准化样本均值的分布与它的Ｂｏｏｔｓｔｒａｐ逼近之间差的一致收敛速度，以及这种逼近与正态分布之间差的一致收敛速度。     

Von-Mises统计量的Edgeworth展开和随机加权逼近

文［１］讨论了Ｖｏｎ－Ｍｉｓｅｓ统计量的一种能达到Ｏ１ｎ的精确性的随机加权逼近，本文则给出了这种统计量的一阶Ｅｄｇｅｗｏｒｔｈ展开和一种能达到ｏ１ｎ的精确性的新的随机加权逼近．     

On the distributions of the ratios of the extreme roots to the trace of the Wishart matrix

In this paper, the authors cosider the derivation of the exact distributions of the ratios of the extreme roots to the trace of the Wishart matrix. Also, exact percentage points of these distributions are given and their applications are discussed.     

On the comparison between the APV and the NPV computed via the WACC

The valuation of levered investment in the practice is made with the WACC approach, even if the superior technique of the APV is available. The paper shows that the APV can be interpreted as the arbitrage free value of the portfolio made by an investment and a supporting loan. Therefore the WACC evaluation, generally different from the APV, allows for arbitrage. We provide various conditions which completely characterize the sign of the error as a functions of all the variables entering the model.     

用常微分方程模型分析预防和隔离措施对SARS发病率的影响

通过建立常微分方程模型 ,分析了预防和隔离措施对 SARS发病率的影响 ,并把计算结果与实际统计数据进行了比较 ,结果表明 ,及时高效的预防和隔离措施能够有效地控制 SARS的传播 .     

From the neutrino to the edge of the universe

Two recent findings necessitate a closer look at the existing standard models of particle physics and cosmology. These are the discovery of neutrino oscillation, and hence a non-zero mass on the one hand and, on the other, observations of distant supernovae which indicate that contrary to popular belief, the universe would continue to expand for ever, possibly accelerating in the process. In this paper it is pointed out that relatively recent studies which indicate a stochastic, quantum vacuum underpinning and a fractal structure for space time, reconcile both of the recent observations, harmoniously.     

On the Gap in the Spectrum of the Translations

The spectrum of the translations in local quantum field theory will be analyzed in order to show that in a positive energy representation without vacuum vector and with lowest mass m₁ there is no gap in the spectrum which is larger than 2m₁. In particular in a zero mass representation there is no hole at all. These results are obtained with methods of analytic functions of several complex variables.     

From the subalgebras of the square to the discriminator

Presented by A. F. Pixley.     

On the Decomposition of the Riesz Operator and the Expansion of the Riesz Semigroup

For a Riesz operator T on a reflexive Banach space X with nonzero eigenvalues denote by E(λ_i; T) the eigen-projection corresponding to an eigenvalue λ_i. In this paper we will show that if the operator sequence is uniformly bounded, then the Riesz operator T can be decomposed into the sum of two operators T_p and T_r: T = T_p + T_r, where T_p is the weak limit of T_n and T_r is quasi-nilpotent. The result is used to obtain an expansion of a Riesz semigroup T(t) for t ≥ τ. As an application, we consider the solution of transport equation on a bounded convex body.