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 %
Stata日期和时间处理指南说明书 in Stata Gabriela Ortiz Applied Econometrician StataCorp LLC 1
How can I quickly convert many string variables to numeric variables? 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...
clear input str10 String Number"1"1"2"2"3"3"4"4end*导致问题**1.条件筛选 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=...
a \ -98=.b) hospital: string variable ignored docid: string variable ignored lungcapacity: 9 missing values generated smokinghx: string variable ignored sex: string variable ignored wbc: string variable ignored test1: 4 missing values generated test2: 4 missing values generated dis_date: string ...
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 ...
Convert dates and datetimes in string form to numeric form with great flexibility, including support for any order of year, month, day, hour, minute, second, and millisecond Extract day, day of week, week of year, month, quarter, half-year, or year from specified date Extract hour, minut...
Stata数据管理—数据管理命令简介说明书 Title stata.com Data management—Introduction to data management commands Description References Also see Description This manual,called[D],documents Stata’s data management features.See Mitchell(2020)for additional information and examples on data management in Stata....
date order_date "订单日期" } PRODUCT { int product_id PK "产品ID" string product_name "产品名称" float price "产品价格" } ORDER_PRODUCT { int order_id FK "订单ID" int product_id FK "产品ID" int quantity "数量" } CUSTOMER ||--o{ ORDER : 购买 ...
In Stata you need to convert this string variable to a date variable.* A closer inspection of the variable, for the years 2000 the format changes, we need to create a new variable with a uniform format. Type the following: stata操作介绍之时间序列分析 PPT stata操作介绍之时间序列分析 一、 ...