图2. 宽形数据(wide form) 使用Stata 进行数据处理十分便捷,其中的reshape命令就是用于实现数据形态之转换的,即 Convert data fromwidetolongform and vice versa。不论哪种数据形态,数据集中均包含两种形态下的全部信息,区别在于数据呈现的方式。 本文是对reshape命令的介绍,力图通过10个示例全面介绍该命令的使用方...
String variables 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 mat...
. . . . Change string variables to numeric [R] encode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Encode string into numeric and vice versa [R] generate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
destring makes converting variables from string to numeric easier. net search searches the web for user-written additions to Stata, displays information and help files for these additions and allows these additions to be installed or uninstalled with just a mouse click. This facility provides direct...
(~3.5GB), this choice can make a substantial difference in performance. Using the Stata timer command, we performed standardized benchmarks of common programming tasks, such as searching the NIS for a list of ICD-9 codes, converting string data to numeric and putting numeric variables in ...
Stata入门2——数据篇 2021年2月16日星期二 《计量经济学软件应用》课程讲义 1 一、数据录入 直接录入打开dta数据文件导入其它格式的数据文件其它方式 2021年2月16日星期二 《计量经济学软件应用》课程讲义 2 1直接录入 （1）直接在stata中录入（适用于小样本少变量数据）：打开程序，调用数据编辑窗口，直接录入...
1、缺失值编码Change missing values to numeric values：mvencodevarlist [if] [in], mv(#|mvc=# ...
Change: Wed May 3 18:24:30 2017 四·格式 Formats 格式串与printf格式相似,在于他们开始与%,之后跟着格式的字符,以选择了stat结构体中被格式的字段(fields)的字符而结束。 %n表示另起一行; %t表示tab; %%表示百分比字符; %@表示当前文件数量。
varlist. Missing numeric values (see missing) are interpreted as being larger than any other number, so they are placed last with . < .a < .b < ... < .z. When you sort on a string variable, however, null strings are placed first and uppercase letters come before lowercase letters....
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....