1、stata入门入门3统计指标篇统计指标篇江金启沈阳农业大学经济管理学院-精品-一、基本描述统计量一、基本描述统计量lsummarize命令l可概括观测值个数、平均值、标准差、最大值和最小值五个指标。l语法：summarize varlist in if weight,optionsl选项：detail可统计方差、偏度、峰度和各个分位数等指标。l范例：summarize price mpg-精品-2022-10-102l菜单：Statistics Summaries,tables,and tests Summary and descriptive statistics Summary stati
2、stics-精品-2022-10-103tabstat命令命令l语法：tabstat varlist if in weight,optionsl选项：默认结果是均值。lby(varname)按变量varname进行分组描述性统计；lstatistics(statname.)报告指定的描述性统计指标值。lnototal不报告总体统计值，通常是与by()配合使用 lmissing用by()选项时，显示by()变量的缺失值也作一类的结果。l范例：tabstat price mpg,by(id)statistics(mean ma mi sd n)missing-精品-2022-10-104l菜单：S
3、tatisticsSummaries,tables,and testsTablesTable of summary statistics(tabstat)-精品-2022-10-105ameans命令命令l估计算术、几何和调和平均数l语法：ameans varlist if in weight,optionsl范例：ameans price-精品-2022-10-106l菜单：Statistics Summaries,tables,and tests Summary and descriptive statistics Arith./geometric/harmonic means-精品-20
4、22-10-107二、单个分类变量的汇总统计二、单个分类变量的汇总统计ltabulate/tab1命令l对分类变量的描述统计是观察其不同类别的频数或百分数。l语法1：tabulate varname if in weight,optionsl语法2：tab1 varlist if in weight,optionsl选项：missing缺失值也作一类，plot作柱状图l范例：tabulate foreign/tab1 foreign id-精品-2022-10-108l菜单1：Statistics Summaries,tables,and tests Tables One-way tables
5、-精品-2022-10-109l菜单2：Statistics Summaries,tables,and tests Tables Multiple one-way tables-精品-2022-10-1010三、两个分类变量的列联表三、两个分类变量的列联表l列联表是考察两个分类变量相关关系的方法l列联表给出从属于两个分类变量不同类别的观测值的频数l如果两个分类变量各有r,c个类别，则列联表共有rc个单元格 Total 11 53 64 Foreign 4 16 20 Domestic 7 37 44 Car type 1 2 Total id-精品-2022-10-1011ltabulate命
6、令：l语法1指定两个变量的列联表ltabulate varname1 varname2 if in weight,optionsl范例：tabulate foreign id-精品-2022-10-1012l菜单：Statistics Summaries,tables,and tests Tables Two-way tables with measures of association-精品-2022-10-1013l语法2多个变量内存在的所有可能列联分析结果ltab2 varlist if in weight,optionsl范例：tab2 foreign id rep78-精品-2022
7、-10-1014l菜单：Statistics Summaries,tables,and tests Tables All possible two-way tabulations-精品-2022-10-1015四、列联表描述统计量四、列联表描述统计量l tabulate,summarize()：单个或两个分类变量的描述性统计l格式：tabulate varname1 varname2 if in weight,optionsl选项：no means（不）包含均值，no standard（不）包含标准差，no freq（不）包含频数，no obs（不）包含观测值个数，missing将缺失值作为一
8、类-精品-2022-10-1016l菜单：Statistics Summaries,tables,and tests Tables One/two-way table of summary statistics-精品-2022-10-1017五、经验分布函数五、经验分布函数l对变量累积分布函数的估计lcumul命令：通常与scatter（做散点图）一起使用l格式：cumul varname if in weight,generate(newvar)optionsl选项：freq使用频数作为累积分布l范例：cumul price,generate(cprice)l scatter cprice price-精品-2022-10-1018l菜单：Statistics Summaries,tables,and tests Distributional plots and tests Generate cumulative distribution-精品-2022-10-1019六、正态性检验六、正态性检验lsktest varnamelswilk varname-精品-2022-10-1020本讲练习本讲练习-精品-2022-10-1021
