简单实用的求标准正态分布函数值的算法，误差不超过百万分之一

具有 LN(mu,sigma) 的任何不确定参数 X 的“n”阶系数可以分析计算为： ai_a=sigma^n*exp(mu+sigma^2/2)/(n!) 代码使用Matlab符号积分计算系数

自己做的正态图，供大家参考自己做的正态图，供大家参考

三、相关系数的极大似然估计 极大似然估计有一个重要性质：设 的极 大似然估计是 ，而且变换 是一一 对应的，则 的极大似然估计就是 。 利用这一性质就可得到以下各相关系数的极大 似然估计。这里均假定 。

正态分布的尺度混合及有限混合 在最近股票收益率研究中!人们倾向于利用正态分布的尺度混合或有限混合。 尺度混合 对数收益率服从均值为u，方差为sigma^2的正态分布，但是方差是一个随机变量。 有限混合 一个有限混合的例子：

正态分布图EXCEL教程，一步一步教你如何试用EXCEL做数据正态分布图。

为了解决经典的抗差估计方法中,由于常数项的选取使观测值的属性发生误判,影响最终估计值和迭代次数的问题,以和极大似然估计为准则,推导出一种新的抗差估计权函数,并从理论上论证了其特性。通过与经典的抗差估计方法相比较表明,新的估计方法不但具有较强的抗差性,并且能够弥补经典抗差估计方法存在的缺陷。该方法对于经典抗差估计的研究具有一定的指导意义。

MATLAB拟合出指定数据的正态分布函数和对数正态分布函数

The Bell Curve by Richard J. Herrnstein and Charles Murray Pirated Edition PART 1. THE EMERGENCE OF A COGNITIVE ELITE 1 Cognitive Class and Education, 1900-1990 29 2 Cognitive Partitioning by Occupation 51 3 The Economic Pressure to Partition 63 4 Steeper Ladders, Narrower Gates91 PART 2 COGNITIVE CLASSES AND SOCIAL BEHIOR 5 Poverty 127 6 Schooling 143 7 Unemployment, Idleness, and Injury155 8 Family Matters167 9 Welfare Dependency191 10 Parenting203 11 Crime 235 12 Civility and Citizenship 253 PART 3 THE NATIONAL CONTEXT 13 Ethnic Differences in Cognitive Ability 269 14 Ethnic Inequalities in Relation to IQ317 15 The Demography of Intelligence 341 16 Social Behavior and the Prevalence of Low Cognitive Ability 369 PART 4. LIVING TOGETHER 17 Raising Cognitive Ability389 18 The Leveling of American Education 417 19 Affirmative Action in Higher Education 447 20 Affirmative Action in the Workplace 479 21 The Way We Are Headed509 22 A Place for Everyone 527 APPENDIXES Statistics for People Who Are Sure They Can’t Learn Statistics 553 ù Technical Issues Regarding the National Longitudinal Survey of Youth 569 3Technical Issues Regarding the Armed Forces Qualification Test as a Measure of IQ 579 4 Regression Analyses from Part 2 593 5 Supplemental Material for Chapter 13 625 6 Regression Analyses from Chapter 14 645 7 The Evolution of Affirmative Action in the Workplace655 Notes 665 Bibliography 775 Index 833 some Bigots and Enthusiasts, and through Fear assented to by some wiser and better Men; it is this. They argue against a fair Discussion of popular Prejudices, because, say they, tho’they would be found without any reasonable Support, yet the Discovery might be productive of the most dangerous Consequences. Absurd and blasphemous Notion! As if all Happiness was not connected with the Practice of Virtue, which necessarily depends upon the Knowledge of Truth. EDMUND BURKE A Vindication of Natural Society

利用微积分和矩阵代数的基本知识,证明了n维正态随机变量各分量的线性组合一定服从正态分布的结论。