用Excel统计数值型数据频数分布的三种方法

本文根据两种不同的数据分组方式,分别讨论了利用Excel软件统计数值型数据频数分布的三种基本方法并作了简要评述。     

Uniformly strong consistency and Berry-Esseen bound of frequency polygons for α-mixing samples

In this article, the frequency polygon investigated by Scott is studied as a nonparametric estimator for α-mixing samples. By some known exponent and moment inequalities, we obtain the uniformly strong consistency and Berry-Esseen bound of the estimator. The present results relax the relevant conditions used by Carbon et al. Furthermore, the convergence rate of the uniformly asymptotic normality is derived, which is O(n^{? 1/11}) under the given conditions.     

索赔次数的开放式混合泊松分布研究

本文建立了索赔次数的多风险类别混合泊松模型。首先,考虑索赔次数的零膨胀、厚尾性和异质性等特征,建立风险类别待定的开放式混合泊松模型,开放式结构使该模型对实际数据的多样特征和风险类别具有良好的自适应性;其次,定义混合权重参数的iSCAD惩罚函数,实现对权重参数的筛选;最后,借助EM算法求得模型参数,实现对各风险类别下索赔次数的估计。借助iSCAD惩罚函数,给出最优混合数,避免传统混合模型中主观选择的弊端,克服传统混合模型中结构复杂、参数估计没有显式表达式、估计结果不便于解释等问题。基于三组风险特征多样数据的实证分析,本文发现该模型可以显著改进现有模型的拟合效果。     

Age at First Marriage and Age at Death in the Lincolnshire Fenland, 1252–1478

In five Lincolnshire villages between 1252 and 1478 there is evidence that men and women married fairly late before the Black Death, and that by 1348/9 the Western European marriage pattern of late and prudential marriage was well established. Households were usually nucleated; husbands were on average eight years older than their wives before 1348/9, and five years older after 1348/9. Marriages were short: according to the best calculation shorter before 1348/9 than after, most often terminated by the death of the first husband, and were unlikely to produce more than three children. Since there were more males than females amongst children and young adults, many men remained unmarried, but since the death rate of women was very high, men lived longer.     

A Note on Exponentially Smoothed Seasonal Differences

Filtering economic time series can be justified if variations within a certain frequency interval are relevant for the problem at hand. It is shown here that exponential smoothing of seasonal differences provides a simple means of damping short oscillations, including seasonal ones.     

多时滞差分方程的频率振动性(英文)

讨论了多时滞差分方程的频率振动性，获得的振动判定准则，改进了文献［２］中的相应结果     

瑞利能量分析法在梁的振动分析中的应用

本文利用瑞利（Rayleigh）能量分析法求出了连续梁的最小频率，并与其精确解进行了比较。     

B染色体

(B染色体)超数染色体,是存在于许多有机体中的额外染色体及染色体断片。B染色体有特殊的性状和行为,在基因组进化中起了重要作用。本文对其起源、进化及其特性进行了较为全面的概述,希望为进一步研究提供参考。     

计算机辅助扩充频率法

本文基于Nyquest稳定性准则和扩充频率法,对含有滞后环节的被控对象的系统,提出一个能在微型计算机上实现的、能进行比例、比例加积分(和加微分)的整定参数计算的计算机辅助设计算法.本法使用了寻优技术,能快速求得结果.