利用tostring命令将数值型变量转化为文本格式。示例：将date变量从数值型转换为文本型，命令为tostring date, replace。文本型转数字文字对应表：通过encode命令生成新变量，将文本数据转化为可运算的虚拟变量形式。示例：创建新变量stkcd1，将stkcd变量从文本型转换为数字文字对应表，命令为encode stkcd, gen。
1、Quarterly date from daily date 导入数据,查看数据 usedate.dtadesced 可以发现Date2 is a string date variable 然后进行转换 gen datevar=date(date2,"MDY", 2099)format datevar %tdgen quarterly = qofd(datevar)format quarterly %tq 2、Quarterly date from monthly date gen month = month(datevar...
How can I turn a string variable containing dates into a date variable Stata can recognize? How can I extract a portion of a string variable using regular expressions? Error messages How can I handle the matsize too small error? How can I handle the No Room to Add Observations error? How...
dropifString=="1"//字符型dropifNumber==1//数值型/* 字符型数据要加上引号 */**2.运算 gen Add=String+Number/* type mismatch r(109); */gen Number_2=Number gen Add=Number+Number_2//数值运算gen String_2=String gen Add_Str=String+String_2// 字符拼接 总结成两句话:字符型的要带引号;...
Stata日期和时间处理指南说明书 in Stata Gabriela Ortiz Applied Econometrician StataCorp LLC 1
当然GMM 更有名的应用是在动态面板的估计上,我们可以使用 xtabond 估计动态面板。以 Stata 自带的数据 abdate.dta 为例,进行实验: webuse abdata,clear` `xtabond n L(0/1).w L(0/1).k, lags(1) noconstant vce(robust) 结果如下: Arellano-Bond dynamic panel-data estimation Number of obs = 751 ...
18、到price2前面的$号消失,percent2后面的号消失dateprice price2 perce nt perce nt234861. 19991210$2,343.682343.6834%2. 20000708$7,233.447233.4486%d/注意到price2和percent2均变为数据值型变量double和byte *3.3.2数值型转化为字符型:tostringwebusetostri ng, clear/*该数据中年月日的数据类型不一样...
. . . . Change string variables to numeric [R] encode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Encode string into numeric and vice versa [R] generate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
String functions help string functions 1. 实例:股利分配数据(第一列为发布时间,第二列为数额),需要将时间变量切割为年月日。 实现思路:使用tostring命令将数字转化为文字,再进行切割。 use tostring2.dta, clear tostring date_pub,gen(date1) // 数字--》文字 ...
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