sort : change the sort order of the dataset drop : drop certain variables and/or observations keep : keep only certain variables and/or observations append : combine datasets by stacking merge : merge datasets (one-to-one or match merge) encode : generate numeric variable from categorical varia...
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...
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...
. . . . Change string variables to numeric [R] encode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Encode string into numeric and vice versa [R] generate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
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=# ...
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....