String variable stata. 2 Categorical string variables A variable might contain strings becaus...
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String variable stata. 2 Categorical string variables A variable might contain strings because it records categorical information. String processing is fairly easy in Stata because of the many built-in string functions. There are some very good summaries that cover aspects of string variables (e. Suppose that you have read in a dataset that contains a variable called sex, recorded as “male” and “female”, yet when you attempt to run a linear regression, the following message is displayed: This is a modified version of the auto data set that comes with Stata. From string to numeric variables Even though Stata can handle string variables, it is clear in many respects that numeric variables are much preferred. A numeric value like 42 within a numeric variable and a string value like "42" within a string variable are quite different. 24. The first column shows the code you would use, the second column shows how your data might look like before applying the code, and the third column shows how your data would look like after applying the code. 4. 3 Factor variables. Stata has a lot of functions that greatly facilitate working with string variables. Jul 16, 2020 · This page shows examples of how one might use string related commands in STATA. Among these string functions are three functions that are related to regular expressions, regexm for matching, regexr for replacing and regexs for subexpressions. Besides applying the commands below to data, you also may want to apply the same commands to STATA macros In this video, we discuss how to extract specific text from a string variable using substr and the word function. In turn, that could mean missing values; string variables where numeric variables are needed; overexclusive if or in qualifiers; and yet other possibilities. Nov 16, 2022 · Warning: If you have more than 67,784 unique values of the string variables that you are encoding, encode will complain. The difference between numeric and string variables in Stata is a big deal. Description encode creates a new variable named newvar based on the string variable varname, creating, adding to, or just using (as necessary) the value label newvar or, if specified, name. Stata’s primary sense of a word within a string is that words are separated by spaces. This blog post will delve into four Stata commands that will simplify the way you handle text data: destring, tostring, encode, and decode. DATA CLEANING ROUTINE FOR STRING VARIABLES Many raw data sets – survey as well as administrative data – contain string variables that need to be cleaned before they can be processed and analysed. We will show some examples of how to use regular expression to extract and/or replace a portion of a string variable using these three functions Oct 17, 2022 · Useful string functions in Stata (updated list) Most often when I search the internet for help on Stata, it is probably when I need to work with string variables (such as names). Nov 16, 2022 · You can use Stata's string variables to hold exceedingly long strings, even the contents of files, and even binary files. egen nb = group(b) which will generate a numeric variable nb that does not have value labels. Nov 16, 2022 · Sometimes, data that look like numbers are actually stored as strings. variable might contain strings because it is an identifying variable. You need to dig deeper to work out which is biting you. This is a proper use of string variables. g. Fortunately, Stata offers some easy ways for converting string to numeric variables (and vice versa). Further, how to count the number of characters in the string variable or count the gender really is a numeric variable, but because all Stata commands understand value labels, the variable displays as “male” and “female”, just as the underlying string variable sex would. If that is the case, then you can use . In some Stata contexts, double quotation marks bind together more strongly than spaces separate, so "Stata is subtle" would be treated as a single word if the quota-tion marks were explicit. For those using Stata, managing and cleaning string variables (text data) can initially seem challenging, but with several commands, it becomes a smooth process. We will need to convert these variables to numeric data before we can use them with Stata's statistical features. . display options display additional statistics suppress the display; calculate only the mean; programmer’s option use variable’s display format draw separator line after every # variables; default is separator(5) control spacing, line width, and base and empty cells varlist may contain factor variables; see [U] 11. , this page). We would like to show you a description here but the site won’t allow us. Employee names in a payroll file, patient names in a hospital file, and city names in a city data file are all examples of this. Let's begin by opening an example dataset from the Stata website and listing the first five observations for the variable chol. Not least, most statistical procedures just do not accept string variables. For present purposes, we will leave that complication aside. The make variable is a text variable giving the make of the car, and price is the price of the car–but currently stored as a string.
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