1 #!/usr/bin/env python3 2 #-*- coding:utf-8 -*- 3 ############################################# 4 #File Name: ci_ex1.py 5 #Brief: 示例1 6 #Author: frank 7 #Email: frank0903@aliyun.com 8 #Creat... Read More
Confidence interval(置信区间) confidence interval (CI) is a type of interval estimate, computed from the statistics of the observed data, that might conta Read More
在 "小马哥课堂 统计学 中心极限定理" 一节的例子中提到一个标准误差的概念，有同学对此不清楚，所以这里单独写一节，来对standard error进行阐述，希望能大家能有一个直观的理解。 Standard error(标准误差) The standard error (SE) of a stati Read More
Central limit theorem(中心极限定理) the central limit theorem (CLT) establishes that, in some situations, when independent random variables are added, their Read More
histogram A histogram is an accurate representation of the distribution of numerical data. It is an estimate of the probability distribution of a cont Read More
Law of large numbers(大数定理) the law of large numbers (LLN) is a theorem that describes the result of performing the same experiment a large number of t Read More
Standard score(z 分数) The standard score is the signed number of standard deviations by which the value of an observation or data point differs from th Read More
Variance(方差) 衡量随机变量或一组数据的 离中 的离散程度 引入例子 假设有两组总体:A={2,2,3,3}, B={0,0,5,5} $$\mu_A=\frac {2+2+3+3}{4}=2.5$$ $$\mu_B=\frac{0+0+5+5}{4}=2.5$$ 显然,$\mu$并不能反 Read More
keytool and jks keytool Name keytool Key and Certificate Management Tool Manages a keystore (database) of cryptographic keys, X.509 certificate chains Read More
期望 前导 假设,盒子里面有n个球，每个球贴上了一个标签，标签上的数字是1 8；那么，从盒子中任取10个球，每次取球的过程相互独立。 1,2,3,4,5,5,7,7,7,8 总共10个数 $$\displaystyle \begin{array}{rcl} mean &=& \frac {1+2+3 Read More