Stata recode string We would like to show you a description here but the site won’t allow us. destring treats both empty strings “” and “. 1. b”, :::, “. First, we make a copy of mpg, calling it mpg3a. One method of converting numbers stored as strings into numerical variables is to use a string function called real that translates numeric values stored as strings into numeric values Stata can recognize as such. String variables are ignored by mvencode. : mvdecode _all, Oct 23, 2019 · The syntax diagram shown in -help recode- starts with -recode varlist -, meaning that you can recode a whole list of variables with a common coding rule. In a case where your string variables are in fact strings (e. e. If a numeric variable is stored as a string variable in Stata, we have several ways to convert them to numeric variables. ” as indicating sysmiss (. We will explore the encoding of categorical string variables into numeric ones using the encode command. Basics. The most Oct 12, 2020 · In this post, I show how to convert string variables to numeric in Stata. String variables are shown in red . Sep 7, 2012 · Stata recognizes these non-numeric values as “string” values, and their variables are called “string variables. It next informed Converting string variables with numeric values. Apr 26, 2021 · recode is for numeric variables only, you can use replace. If you wish to change the categories of a variable, you may employ the command recode. Jun 5, 2015 · I want to generate a new string variable for state abbreviations based upon state names. If you have string variables The easiest way to convert string variables to numeric form is to use the encode command. . If that is the case, then you can use If that is the case, then you can use . Running this command will cause Stata to make a new numeric categorical variable wherein the data has labels that correspond to the old string values. For example, in nhanes2 sample data, we can try creating new categories: race_gender using the following two variables: race and sex . However, sometimes it's not. gen rep78_str = string(rep78) converts the numeric and missing values of rep78 to strings. 《An Introduction to Modern Econometrics Using Stata: Stata Press》学习整理而得，内容未必完全正确，会随学习过程的推进不断补充、修改和更正，… Aug 7, 2015 · recode is meant to change the values of numeric variables to other numeric values; not to strings. 2 Categorical string variables, String functions in[D] functions, and[D] destring. decode creates a new string variable named newvar based on the “encoded” numeric variable varname and its value label. However, you need to use a command called replace instead of recode. Options Main. a”, “. Note that this problem can only arise for string variables, so you need to work on An Introduction to Stata for Health Researchers, Third Edition. gen numeric_var=. If the variable is actually a numeric value that just happens to be stored as a string, see our FAQ: How can I quickly convert many string variables to numeric variables? Let’s say that you have the following data: make: string variable ignored rep78: already 1 in 2 observations foreign: already 1 in 22 observations no action taken r(9); Our attempt failed. Dec 23, 2023 · Here are some of the most essential techniques for generating and recoding variables. A complex string is a string that contains more than one piece of information. 经管之家是一个国内活跃的经济、管理、金融和统计论坛，提供广泛的讨论和资源。 split splits the contents of a string variable, strvar, into one or more parts, using one or more parse strings (by default, blank spaces), so that new string variables are generated. Convert Categorical String Variables to Numeric: The encode Command in Stata. clear set more off input /// byte bytevar 1 2 3 end // add value labels label define lblbyte 1 "A" 2 "B" 3 "C" label values bytevar lblbyte // list list // but they are really numeric values list, nolabel Recode Variables: Command recode. For example, the variable race may be stored with the words "Black", "Other", and "White". strvar itself is not modiﬁed. It is preferable to generate a copy of the old variable before you start replacing values (or expressions, which is the term used below). Complex strings may be very long and may contain binary information. A string containing just a space or spaces is not an empty string; it's not often informative, but that's a human issue. The destring command if varname contains numbers that merely happen to be stored as strings; instead, use generate newvar =real(varname) or destring; see [U] 23. sysuse auto . How do I recode these so Stata recognizes them as missing values? When I have numeric missing values, I have been using e. recode allows you to refer to the minimum and maximum of a variable in the transformation rules. Stata Frequently Asked Questions; How can I quickly convert many string variables into numeric variables? How can I quickly recode continuous variables into groups? How do I standardize variables Sometimes, categorical data are stored as strings. I would like to change the values in my Nationality variable. Thus split is useful for separating “words” or other parts of a string variable. Characters listed in ignore() are removed. destring string_var4, replace force Using -recode- (often more efficient than using gen/replace, 注：本文为 Stata 学习笔记，主要参照教科书：Baum, C. ” In Stata, there are a few ways of converting string variables (with non-numeric values) to numeric variables (with numeric values). The general syntax of the encode command is: encode string_variable, generate(new_numeric_variable) recast—Changestoragetypeofvariable Description Quickstart Syntax Option Remarksandexamples Alsosee Description recastchangesthestoragetypeofvariables. Important to remember: values of string variables must always appear within quotes, if encode—Encodestringintonumericandviceversa Description Quickstart Menu Syntax Optionsforencode Optionsfordecode Remarksandexamples References Alsosee Description will attempt to convert all variables in the dataset from string to numeric. g. ) and interprets the strings “. real(); string() string(n) and real(s) are two string functions that convert numeric/string to string/numeric variables. Here's a simple example. Let’s start with the destring command first. You can read more about this in [U] 12. There is an easier way to recode mpg to three categories using generate and recode. Normally, the recoded variable is not supposed to replace the original variable; rather, you will add the variable with the recoded vlues to the data set under a different name. I have tried several alternatives, most recently based upon Nick Cox's post here: replace cdnew = "AK" if substr(cd) == "Alaska" invalid syntax r(198); I have generated cdnew as string and cd is in the data set as string with state names What am I doing wrong? Recoding variables using recode. Quickstart Jun 3, 2023 · If you would love to create a new variable using multiple variables, you need to use gen and replace instead of recode, since recode only allows us to recode within one variable. : Dec 23, 2023 · An introduction to essential Stata commands for generating, recoding, and rescaling variables. Let's begin by opening and describing an example dataset from the Stata website. The question is explicitly about Stata but the code looks little like Stata. We will need to convert these variables to numeric data before we can use them with Stata's statistical features. recode provides a convenient way to define value labels for the generated variables during the defini-tion of the transformation, reducing the risk of inconsistencies between the definition and value labeling of variables. Chapters 7-8; Stata Learning Modules; Labeling data. The keywords min and max may be included as a from-value, as well as a to-value. The commonest way to achieve this is probably by using the encode command, i. egen nb = group(b) I have a dataset with missing values coded "missing". Variables in varlist that are already numeric will not be changed. I think you want to label your values:. However, a more convenient way for the problem at hand is strtrim(), which removes leading and trailing spaces. mvencode ﬁrst informed us that make is a string variable—this is not a problem but is reported merely for our information. Stata can store strings up to 2-billion characters long and can store strings containing binary information, including binary 0 (\0). Although to Stata a variable is a variable, it is helpful to distinguish among three conceptual types: recode them; see[D] recode. The first line of syntax reads in the dataset shown above. 2006. string(n) is a synonym for strofreal(n) and converts numeric or missing values to strings. z” as Warning: If you have more than 67,784 unique values of the string variables that you are encoding, encode will complain. Recoding string variables builds on the same principle as for numeric variables. 4 Strings. Then, we use recode to convert mpg3a into three categories: min-18 into 1, 19-23 into 2, and 24-max into 3. In Stata an empty string "" is regarded as a missing string. . Creating and recoding variables. A trip through the PDF documentation from -help recode- is worth it, given that the first-line help doesn't detail all the possibilities of this command. , "female" instead of "1") you have to tell Stata to encode [varname] the string data. dppx wsauwvc nmoprk wegco zgqzhfl tcuz dzkr yqn ckvot szt woslif srdph pnggy kegjlqh duclkz