gcollapse, mergemerges the collapsed data set back into memory. This is much faster than collapsing a dataset, saving, and merging after. However, Stata'smerge ..., updatefunctionality is not implemented, only replace. (If the targets exist the function will throw an error withoutreplace). ...
use 企业过度负债, clear merge 1:1 Stkcd year using 彭博ESG披露得分数据库2, nogen keep(1 3) merge m:1 Stkcd using iFinD新能源概念股数据库, nogen keep(1 3) replace NewEnergy = 0 if NewEnergy == . g OD = ExcessiveDebtDegree g ODdum = OD > 0 g Ind = substr(IndustryCode,1,1...
图2给出了95%置信区间的估计系数。 横轴为碳价格稳定机制(CPSM)实施前后的年数,例如6和-6分别代表CPSM实施前6年和实施后6年。 可以接受CPSM实施前CPSM地区和非CPSM地区TFP时变趋势一致的原假设,平行趋势假设可接受。 可以将CPSM的实施作为一个准自然实验来考察CPSM对企业层面全要素生产率(TFP)的影响。 还可以发...
This is allowed for completeness, but it is difficult to imagine an example of when it would be useful. For an m:m merge, varlist does not uniquely identify the observations in either dataset. Matching is performed by combining observations with equal values of varlist; within matching values...
•Browse through the reference manuals to read about statistical methods you like to use,making use of the links to jump to other topics.The reference manuals are not meant to be read from cover to cover—they are meant to be referred to as you would an encyclopedia.You canfind the ...
2、改变定义路径 Stata:cd "mydirectory" R:setwd("mydirectory") 3、打印 "hello world" Stata:di "Hello World" R:print("Hello World") 4、列出前五行变量数据 Stata:list in 1/5 R:head(mydata) 或者 mydata[1:5,] 5、导入/使用数据 ...
merge : merge datasets (one-to-one or match merge) encode : generate numeric variable from categorical variable recode : recode categorical variable destring : convert string variables to numeric foreach : loop over elements of a list, performing a block of code ...
Get A+ grade in STATA assignments and homework by taking help from our PhD Statisticians. We have 350+ statistics experts to provide you with coursework help.
Getting Started in Data Analysis using Stata (v. 6.0) Oscar Torres-Reyna otorres@ December 2007 Stata Tutorial Topics What is Stata? Merge Stata screen and general description Append First steps: Merging fuzzy text (reclink) Setting the working directory (pwd...
merge : merge datasets (one-to-one or match merge) encode : generate numeric variable from categorical variable recode : recode categorical variable destring : convert string variables to numeric foreach : loop over elements of a list, performing a block of code ...