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(附免费安装包)Stata小白必看!实证研究27个高频常用命令

(附免费安装包)Stata小白必看!实证研究27个高频常用命令

引言

做实证研究的朋友,应该都有这个体会:数据整理和分析,占了一篇论文大半的时间。

SPSS太基础,SAS太复杂,R语言学习曲线又太陡。相比之下,Stata是一个很好的选择。它功能强大,许多方面甚至超过SPSS和SAS,但同时也因为需要写命令,吓跑了不少新手。

Stata真的那么难学吗?其实不然。

刚接触时确实会觉得命令记不住、报错看不懂。但只要掌握了最常用的那批命令,你会发现Stata是一个既好学又好用的工具。

今天这篇文章,整理了27个Stata常用命令,从数据导入到回归分析,每个命令都配有实际代码简要说明。建议先收藏,用的时候直接翻出来复制粘贴。

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1

数据导入与预处理

注:红色字体使用时可根据实际情况进行修改

【1】直接导入csv格式数据

insheet using name.csv, clear

【2】修改变量长度

format var %20.2g

【3】删除重复值

sort var1 var2

duplicatesdrop var1 var2, force

【4】数据合并

use data1, clear

merge m:m var1var2 using data2

drop if _merge==2

drop if _merge==1

drop _merge

【5】生成一期滞后项

tsset stkcd accper

gen newvarname=L.varname

【6】将文字转化为数字变量

genBigN=0

replaceBigN=1 if strmatch(dadtunit,"普华永道*")

【7】删除有缺失值的记录

egen mis=rowmiss(_all)

drop if mis

drop mis

【8】行业划分

clonevarsic2=ind

order stkcd accper sic2

replace sic2=substr(sic2,1,1) if substr(sic2,1,1)!=”C”

replace sic2=substr(sic2,1,2) if substr(sic2,1,1)==”C”

tabulate sic2 accper

【9】日期只保留年份

drop if substr( reptdt ,6,2)!="12"

replace reptdt=substr(reptdt,1,4)

gen accper=real(reptdt)

【10】数据分列

split date ,parse(-) destring ignor("-")

【11】求两个日期之间的间隔天数

td=date(trading_date,"YMD")

ed=date(eventdate,"YMD")

form td ed %td

d=ed-td

【12】生成行业、年份哑变量

tab year, gen(year)

tab industry, gen(industry)

【13】对数据进行Winsorize处理

findit winsor2

winsor2 varname, replace cut(1 99)

2

描述统计与检验

【14】描述性统计

tabstat var1var2, stat(n min mean median p25 p75 max sd),  if groupvar==0 or 1

logout, save(name) word replace: tabstat var, stat(n min mean p50 max sd) col(stat)f(%9.2g)

【15】两变量列联表

tabulate var1 var2, row chi2 taub gamma

【16】两样本间的均值T检验

ttest var, by(groupvar)

【17】两样本中位数Z检验

ranksum var, by(groupvar)

【18】Pearson/Spearman系数

spearmanx*n matax=st_data(.,"x*")c=correlation(x)n=rows(c)b=strofreal(lowertriangle(c)+uppertriangle(st_matrix("r(Rho)")),"%9.3f")p=st_matrix("r(P)")for (i=2; i<=n; i++) {for (j=1; j<=i-1; j++) {p[i,j]=2*ttail(rows(x)-2,abs(c[i,j]/sqrt((1-c[i,j]^2)/(rows(x)-2))))b[i,j]=b[i,j]+(p[i,j]<0.01?"***":(p[i,j]<0.05?"**":(p[i,j]<0.1?"*":"")))b[j,i]=b[j,i]+(p[j,i]<0.01?"***":(p[j,i]<0.05?"**":(p[j,i]<0.1?"*":"")))}}c=editvalue(b, "2.000", "1")cend

直接导出结果

logout, save(pw) word replace:pwcorr_avars, star1(0.01) star5(0.05) star10(0.1)

3

分组与回归分析

【19】按年度按中位数分组

方法一

bysort year: egen g=xtile(var), n(2)

方法二

bys accper: cumul icindex, g(g) eq

levelsof accper, local(id)

display "`r(levels)'"

local cut1 = 1/2

foreach x of local id {

recode g (min/`cut1'=0)(`cut1'/max=1) if accper==`x'

}

分三组

bys accper:cumul icindex, g(g) eq

levelsof accper, local(id)

display "`r(levels)'"

local cut1 = 1/3

local cut2 = 2/3

foreach x of local id {

recode g (min/`cut1'=1)(`cut1'/`cut2'=2)(`cut2'/max=3)if accper==`x'

}

【20】输出回归结果

安装

ssc install estout, replace

单个回归

reg

esttab using name.rtf, compress nogap r2 ar2 star(* 0.1 ** 0.05 *** 0.01)

多个回归一起

reg

est store m1

reg

est store m2

esttab m1 m2 using name.rtf, compress nogap r2 ar2 star(* 0.1 ** 0.05 *** 0.01)

连续运行tobit模型结果导出:

esttab m1 m2, b(%9.4f) t scalars(N ll Fchi2 type), using name.rtf, compress nogap

连续运行OLS模型结果导出:

esttab m1 m2, b(%9.4f) tscalars(N r2 F p), using name.rtf, compress nogap

【21】异方差检验及处理

检验:怀特检验

ssc install whitetst

reg

estat imtest, white

处理:“OLS+稳健标准差”

reg y x1 x2 x3, robust

【22】DW检验(序列相关性一阶)

gen id=_n

tsset idestat dwatson

【23】多重共线性

reg y x1 x2 x3vif

【24】是否遗漏高次项

例如,检验y对x的线性回归有没有遗漏高次项

reg y x

estat ovtest

或者estat ovtest, rhs

【25】逐步回归

stepwise, pe(0.1): reg y x

【26】Maddala(1983)两阶段处理效应模型

treatreg yx1-xn, tr(z=w1-wm)two

【27】Justified Jones Model

statsby _b, by(ind accper)saving(*.dta,replace):reg yx, noconstant

merge m:m indaccper using *.dta

gen yhat=y-_b*x

结论

Stata的学习门槛没有想象中那么高。这27个命令涵盖了从数据导入、清洗、合并,到描述统计、假设检验,再到回归分析结果输出的完整流程。掌握这些,大部分实证研究的数据处理工作都能应对。

建议把这篇文章收藏起来,下次处理数据时直接对照使用。熟练之后,你会发现Stata不仅不难,反而非常顺手。

另外,如果你在论文选题、学术写作、期刊筛选、格式校对、发表检索等环节遇到困难,我们也有全流程一对一论文辅导服务。适配本硕博、职称评审、毕业论文、科研提升等场景,包含题、开题、文献综述、研究方法、数据分析、论文写作与修改等全模块支持。资深专家全程跟进,签署保密协议,不做论文代写,严格遵守学术道德。

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  1. CONNECT:[ UseTime:0.000521s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000833s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000251s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000488s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000524s ]
  8. SELECT * FROM `article` WHERE `id` = 556493 LIMIT 1 [ RunTime:0.000929s ]
  9. UPDATE `article` SET `lasttime` = 1776926867 WHERE `id` = 556493 [ RunTime:0.001525s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000305s ]
  11. SELECT * FROM `article` WHERE `id` < 556493 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000492s ]
  12. SELECT * FROM `article` WHERE `id` > 556493 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000430s ]
  13. SELECT * FROM `article` WHERE `id` < 556493 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000714s ]
  14. SELECT * FROM `article` WHERE `id` < 556493 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001287s ]
  15. SELECT * FROM `article` WHERE `id` < 556493 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001410s ]
0.098808s