string variable stata

The nuts and bolts — get familiar with the various characteristics of the classical linear regression model (CLRM), which is the foundation of traditional econometric analysis Form and function — discover how econometric analysis is ... To install: ssc install dataex clear input int year str25 country float rainfallmm 1901 " Afghanistan" 20.910303 1901 " Albania" 103.67812 1901 " Algeria" 9.454398 end gen country2= ltrim ("") gen country3= ltrim (" something") gen country4= ltrim (country) Comment. The "tricks and shortcuts" mentioned were introduced with Stata 12.0. Thus suppose that you create new variables, for example,. The date is stored, however, as the number of days since January 1, 1960. sysuse auto, clear A more commonly used feature in Stata is the split command, that by default splits the variables based on spaces. 22 Jul 2018, 13:54. With over 900 illustrated examples and quick-reference tabs, this book quickly guides you to the information you need for creating and customizing high-quality graphs for any types of statistical data. If the string variable contains anything but numbers, you can add the force option to tell Stata to convert it anyway, but observations with any non-numeric characters will get a missing value. This is necessary as the date function can work only on string variables. Found inside – Page 12In Stata, it is generally advisable to represent these variables by numeric variables, and conversion from string to numeric is straightforward. I have been able to get some success with the following code, but as expected of the levelsof command it only completes the ustrlen() command to only distinct string values. Title stata.com destring — Convert string variables to numeric variables and vice versa Description Quick start Menu Syntax Options for destring Options for tostring Remarks and examples Acknowledgment References Also see Description destring converts variables in varlist from string to numeric. Data Wrangling in Stata: Variable Transformations. Join Date: Apr 2014. Transform string variable to categorical integer variable. This is easy to fix. Older versions of Stata. You can only tell the type of a variable by using the describe command. Let us go through step by step. Using -renvars-. destring to convert string to numeric and vice a versa. The -local- command is a way of defining macro in Stata. One variable represents one prescription. The first tabulate looks identical to the tabulate done on the string variable region above. When I add the variable to the dataset, STATA recognizes it as a string variable. Found inside – Page 188You can create variables up to str80 in Stata . Since a str80 variable can store strings shorter than 80 characters , you might wonder why you should not make all your string variables str80 . You do not want to do this because Stata allocates ... The command assigns the string variable as the label for the numerical variable. In Stata you can create new variables with generate and you can modify the values of an existing variable with replace and with recode. For example, in the –sysuse auto– database, “foreign” is labeled as “Car origin”, 0 … Prior to that, some other commands such as the following were available: renpfix male m. changed the name of all variables that start with "male" by replacing "male" with "m" only. [period] in your dataset. codebook foreign Here we use the -generate- command to create a new variable representing population younger than 18 years old. It is a more complex encoding of date information. In any numeric variable 6==06 and so 06==6. Common tasks with string variables include matching a pattern or searching a location in a string, parsing or subsetting a string, concatenating strings, converting a string to a number etc. Found inside – Page 29When this happens for the first value you enter for a variable, Stata will make the variable a “string” variable, meaning that it is no longer a numeric ... This means that the variable sic0 is numeric. Replace the string variable. In this post we are going to understand how to generate dummy variable in Stata. A Stata macro can contain multiple elements; it has a name and contents. Let’s look at an example. Computing new variables using generate and replace. If you have a string variable that has only numbers in it, then you can alternatively use the real () function. Found inside – Page 21If you record the responses in the first way, it would be what Stata refers to as a string variable. A string variable is a variable in which the contents ... To our end, we can use function dofm (). Create New, or Modify Existing, Variables: Commands generate/replace and egen. Missing data values will affect how Stata handles your data. The person < twin string for Stata means that the value of person is less than the value of twin. where make1 is the new variable in the numeric form. But let me refer here to the Stata help at help rename group. For example, in the –sysuse auto– database, “foreign” is labeled as “Car origin”, 0 … In that case, you should find out the numeric value labeled as "Germany" – cap.py Jul 1 '20 at 6:18 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. Downloadable! hence the variable country is not a string variable. that inequalities can be resolved for string arguments as well as for numeric arguments, and equally that cond() will readily produce string results if instructed. For example, bytevariables can store numbers between -127 … Converting dates entered as strings into numeric dates that can be used by Stata is relatively simple. Combining strings into one variable Posted on November 24, 2020 by Jan Sauermann I’m again playing around with strings in Stata and need to combine (string) variables with (string) variables as well as strings in locals with string variables. Complex strings may be very long and may contain binary information. The following loop will first check the type of a variable. In that case, Stata will split the data set up into one group for each unique combination of the variables. Stata allows the labeling of variables and also the individual values of categorical or ordinal variable values. In this post we are going to understand how to generate dummy variable in Stata. Found inside – Page 20Stata names are case-sensitive: Age and age are different variables. ... are two types of variables in Stata, string variables and numerical variables. It might be a numeric variable with value labels. The command you need is "labmask" (type "findit labmask" into Stata and it'll find it). The data set must still be sorted in the same order. If it is a string variable, then change the value of the variable to all lowercase. One example: When I use functions: -regexm-, -strpos- or -strmatch- and I am searching for "INC" only Stata return all observation that contain "INC" like INCOME or something else, but I need only observations with "INC" I am not quite sure what "earlier" means exactly. Solving a common problem. set obs 1 obs was 0, now 1. generate mynum = 42. generate mystr = "42" Now type. Dirk Enzmann. But what is also available is the Stata’s suite of converting time format functions. Before we can use the Stata time-series or panel-data capabilities, we need to convert the string date to a Stata date. Found inside – Page 43Stata automatically decides whether each data column represents a numeric or string variable. If there are non-numeric values in a column, Stata takes that ... Compare the results of: Code: * Example generated by -dataex-. Roger- … In most cases, Stata can handle dates in which the days were entered as one or two digit numbers, and in which the month was entered as either abbreviation (e.g. Note: This module should be installed from within Stata by typing "ssc install sxpose". Read the Stata manual for a full list of string functions When cleaning datasets one often has string variables containing categories (e.g. Fulfilling this need, A Handbook of Statistical Analyses Using Stata, Fourth Edition has been fully updated to provide an introduction to Stata version 9. This edition covers many Other commands which can be used are: compress to compress the memory. : where oldvar is the name of the old variable and newvar is the name of the new variable. String variables were introduced in Stata 2.0 in June 1988, and they could hold any even number of characters from 2 (str2 type) to 80 (str80 type). Found inside – Page 101Stata Corporation. split . Split string variables into parts Syntax split strvar ( if exp ] [ in range ] [ , generate ( stub ) parse ( parse_strings ) limit ( # ) no trim destring destring_options ] Description split splits the contents of a string variable strvar ... … In earlier versions, a string variable could contain up to 244 characters. If you are working with string variables, the data will appear as [blank]. In this book, author Kyle Longest teaches the language of Stata from an intuitive perspective, furthering students’ overall retention and allowing a student with no experience in statistical software to work with data in a very short ... In this section we will see how to compute variables with generate and replace. This post demonstrates how to create new variables, recode existing variables and label variables and values of variables. The second line of code uses the date function to generate a new variable date2 from the existing variable datevar. Merge – adds variables to a dataset. Easy peasy, you can use the following syntax. must. If you have a string variable and want to convert it to a numeric variable, you can use the encode command. Thus suppose that you create new variables, for example,. Found inside – Page 432To do this using Stata's reshape long command with the string option, we must first define a new variable i for the i() option that takes on a different ... sysuse auto . Here we introduce another command -local-, which is utilized a lot with commands like foreach to deal with repetitive tasks that are more complex. This video demonstrates how to convert categorical string variables to labeled numeric variables. Note: This module should be installed from within Stata by typing "ssc install sxpose". 12+ ways to name and label variables in Stata. [period] in your dataset. Hello together, Is there a command in Stata which to search in string variable for a particular word and to return only this word. SXPOSE: Stata module to transpose string variable dataset ," Statistical Software Components S446402, Boston College Department of Economics. The first line of code converts the numeric variable to string variable. ... Output Stata’s ttest results with esttab including means of each group; Merge datasets by partially matching key variables in Stata; For loops in Stata; How to save contents from Stata’s review window into a do-file; Tags. Download the do file that have all the codes used in this article. SPSS String Function. In the following table, the first column shows different date formats in which the date is already recorded and brought into Stata. SPSS' string function converts numeric values to string values.Its most basic use is compute s2 = string(s1,f1). To convert, use the command “destring ”. Before we can use the Stata time-series or panel-data capabilities, we need to convert the string date to a Stata date. From the first row of observations. foreach var of varlist _all { local vartype: type `var' if substr ("`vartype'",1,3)=="str" { replace `var'=ustrlower (`var') } } 1. Handle: RePEc:boc:bocode:s446402. Jan, Sept, Sep), or typed … This post demonstrates how to create new variables, recode existing variables and label variables and values of variables. String variables are shown in red . Indicator variables are also called dummy variables. With regard to our test data, the syntax below shows how to convert numeric_1 into (previously created) string_3. Found insideAlthough Stata will analyze string variables, strings are not covered in this book. To understand a variable in human language, therefore, we need a set of ... There are maximum and minimum values that each variable type can store. Found inside – Page 262.2.4 String-to-numeric conversion and vice versa Stata has two types of variables: string and numeric. Often a variable imported from an external source ... #2. The YMD is called a mask, and it tells Stata the order in which the parts of the date are specified. Some common procedures are below; for others, check the Stata … Found inside – Page 45The Windows platform professional version of Stata (Stata/SE) supports a maximum of 32,766 variables with string variables up to 244 characters, ... Code: ds, not (type string) will list all variables that are not string variables (str# or strL). This command is used to convert string variables into numeric variables and vice versa. Consider the following two examples: Let’s start with the destring command first. Check the variable type to see its maximum length (18, or whatever), generate a new empty-string variable, and then loop over the characters, adding them to the end of the new variable only if they are as desired. I’m again playing around with strings in Stata and need to combine (string) variables with (string) variables as well as strings in locals with string variables. This article will introduce you to some of the most useful and easy to use features. Run the compress command to actually shrink the variable types. A simple way of transforming such a variable to one variable containing the same information is encode. Here we use the -generate- command to create a new variable representing population younger than 18 years old. Found inside – Page 49The way to deal with such data is to (1) read the data into string variables in its original form, (2) convert the strings into numeric variables (Stata ... After reading this introductory text, you will be able to enter, build, and manage a data set as well as perform fundamental statistical analyses. The book comprises the contributions of the Stata community that have appeared in the Stata Journal since 2003. As of Stata version 12, value labels are also shown in the "Variables" section of the Properties window. See[D] egen for more information. In any numeric variable 6==06 and so 06==6. But note that as of version 13.0, Stata offers two types of string variables: "Short" string variables with up to 2045 characters. Stata variables are all associated with a display format. 1. Found inside – Page 27Converting variable types A variable can be coded in either a numeric or a string format. A numeric variable deals with numbers, whereas a string variable ... Thus, a single character would need to be held in a str2 variable. Converting string variables with numeric values. generate newvar = "" quietly forvalues i = 1/18 The commands vary somewhat based on the format in which the data were entered and how consistently that format was applied. When I try to destring the variable with: destring Age, replace. This means that the variable sic0 is numeric. Nicholas J. Cox, 2004. " Stata variables are all associated with a display format. Using loop -forvalues-. recast to change storage type. Stata has some utility commands for creating new variables: The egen command is useful for working across groups of variables or within groups of observations. You should type keep if facility=="bir" That way, Stata knows that "bir" is a string value. set obs 1 obs was 0, now 1. generate mynum = 42. generate mystr = "42" Now type. Now we are ready to extract month and year information from variable date. See the help for encode and label. SXPOSE: Stata module to transpose string variable dataset ," Statistical Software Components S446402, Boston College Department of Economics. Found inside – Page 34Each column then represents a specific variable or, in the jargon of Stata, a varlist, ... This is because Stata has interpreted these variables as strings. country names). This is part four of Data Wrangling in Stata. 11 Jul 2018, 23:30. Even though Stata can handle string variables, it is clear in many … The common variables . Nicholas J. Cox, 2004. " Let us go through step by step. String processing is fairly easy in Stata because of the many built-in string functions. Merging two datasets require that both have at least one variable in common (either string or numeric). data_memory and created a truncated variable (name2) from the original variable using the following line of code. You can then use that number in a variety of ways. Uses include: converting numbers formatted with commas to ordnary strings, standardising codes that sometimes include spaces. A complex string is a string that contains more than one piece of information. It creates a new string variable that gets its variable values from the previous label values. For example, if a variable contains " Arizona", a command that contains an if command such as ... if state="Arizona" won’t detect this observation.. To trim blank spaces at the beginning or the end of the value, Stata has different built-in functions: Stata allows the labeling of variables and also the individual values of categorical or ordinal variable values. foreach var of varlist _all { local vartype: type `var' if substr ("`vartype'",1,3)=="str" { replace `var'=ustrlower (`var') } } 1. For more information on date conversion functions, type help functions in the Stata command window and click on the link for datetime functions. Strings can be converted into numeric in two ways. For example, I had a list of towns ('town') as a string variable, and a corresponding rank ('rank') which is numeric. In order to replace “make”, we will use the command: destring make, replace Among these string functions are three functions that are related to regular expressions, regexm for matching, regexr for replacing and regexs for subexpressions. Found insideList Values for All Observations of Selected Variables list varname1 varname2 Destring: Changing Format From String Variable to Numeric destring varname, ... In Stata, there are a few ways of converting string variables (with non-numeric values) to numeric variables (with numeric values). There are no observations because regress, along with most of Stata’s “analytic” commands, cannot deal with string variables. Commands want to see numbers, and when they do not, they treat the variable as if it contained numeric missing values. Despite this limitation, it is possible to obtain tables: 1 2[U] 23 Working with strings Stata has many tools for working with dates. recast to change storage type. On the main Stata window, click on “ variable manager ” to manage variables. For each variable, the properties are defined on the right hand side: notes (if any) can be added. In case of categorical variables define values by clicking on “Manage”. 6destring— Convert string variables to numeric variables and vice versa We want to remove all of these characters and create new variables for date, price, and percent If this file is a tab-delimited file and it is imported, Stata will automatically recognize Row 1 as variable names. If you map to a numeric variable, you can use value label definitions to insist on a different order. . The variable does not contain nonnumeric characters. have the same name. where s2 is a string variable, s1 is a numeric variable or value and f1 is the numeric format to be used. When generating a new variable. For example, 31 Dec 1959 is -1 days elapsed since 01 Jan 1960. Found insideExplore the big data field and learn how to perform data analytics and predictive modelling in STATA About This Book Visualize and analyse data in STATA to devise a business strategy Learn STATA programming and predictive modeling Discover ... Using -labgen-, -labgen2-, or -genl-. 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. It will work with all of the variables you show, except date. The syntax is just destring variable, replace, where variable should be replaced by the name of the variable (or variables) to be destringed. Extracting variable labels and categorical/ordinal value labels in Stata. If you are working with string variables, the data will appear as [blank]. Coding string values (‘Male’, ‘Female’) in such a manner allows us to use these variables in regression analysis with meaningful interpretations. If you type keep if facility==bir then Stata will look for a string variable named bir, and will complain if it doesn't find it. Users can assign such a display format or work with a display format assigned by default. All date functions takes two arguments: the name of the string variable and a string specifying the order of the date and time components called mask. Numeric format to be a numeric variable, you will see suite of converting time format functions character... Criterion for a full list of string functions the following table, the properties are on! Data come with Stata as examples.-generate-: create variables and replace string sure! Help strtrim ( ) that extracts bytes 1 to 30 from the existing datevar. `` earlier '' means exactly when cleaning datasets one often has string variables, the syntax below shows to. And it 'll find it ) all of the type would be.! Into encoded numeric variables shorten their values, i.e volume is providing econometric... Been str7 or str42, the syntax below shows how to create a new variable population. Generate mystr = `` 42 '' now type lower cases while its decode. Not ( type `` findit labmask '' ( type string ) will list all variables contain... 0, now 1. generate mynum = 42. generate mystr = `` '' quietly forvalues =. And/Or string variables, the first dataset i.e: age and age are different variables destring command first strings... Code uses the date is stored as strings, standardising codes that sometimes include spaces two datasets require that have! Or modify existing, variables: commands generate/replace and egen split the data set still! We use variables of the new variable representing population younger than 18 years old Stata,. The real ( ) if you did want to see numbers, and the dataset can be added the! Given to the dataset can be up to 244 characters of elapsed days 42. generate mystr = `` ''. Is lower ( ) if you have two string variables ( str # or strL ) `` variables '' of... _ pts junk minimi 55 4 units wide up into one group for each,. To Stata 13, this fourth edition is written for both Windows and Mac users,. For storing numbers ; string resembles a text variable '' quietly forvalues i = 1/18 where is! Generate newvar = `` '' quietly forvalues i = 1/18 where make1 is split. Because Stata allocates... found inside – Page 260Release 5 Stata Corporation a varlist, Stata! Provide robust examples and offer the datasets for download online data will appear as [ blank ] forvalues. Patients in wide Stata format: 1 observation per patient with several hundreds variables each data column represents a variable... Existing string variable in Stata string date to a numeric variable, can!: create variables all lowercase containing the same information is encode generate a new variable representing population younger 18. For the first observation foreign data Wrangling in Stata based on a different order the middle, then change value... More complex encoding of date information [ P ] macro correspond to Stata 13, this fourth edition is for... Two types of variables a dummy variable in Stata shrink string variable data sets generate mystr = ''! Spdlimit acc _ pts junk minimi 55 4 a name and label and... In it, then you can create new variables with generate and replace ”. Destring works on string variables that express or shows information in a variety of ways treats them as string (. The main Stata window, click on “ variable manager ” to manage variables years.! Ways to convert them into a Stata date, the syntax below shows to! Only numbers in it, then change the value of person is less than value! Them as string variables into numeric variables, the data will appear as [ blank ] more one. It ) character would need to be used will see generate dummy variable in the middle,.. Compress the memory three characters of the variables based on a sub-string an... 104When we typed input acc_pts, Stata assigns negative numbers as the date function to generate dummy in! Destring ” handles your data ) if you have a string variable dataset, Stata does actually. The variables you show, except date characters ( usually punctuation marks ) string! Than the value of the values of variables in Stata ) if you have a string variable Boston! Must still be sorted in the jargon of Stata, by J. Scott long, considered. ; it has a name and label variables and values of categorical or ordinal variable values values of or! ; it has a name and label variables and label variables and the... Consider the following line of code uses the date is stored as a string variable dataset, '' Software. Still be sorted in the jargon of Stata, a varlist, list! Recode the variables that are not covered in this post we are going to understand how to generate variable! ( type string ) will list all variables that are not string variables, and when they do want. However, as the number of elapsed days set obs 1 obs was 0 now! Not covered in this book, what is also available string variable stata the variable! For each unique combination of the properties are defined on the main Stata window, click on manage. Associated with a display format assigned by default splits the variables you want to this. Notes ( if any ) can be used reading → But what is also documented in P... Cleaning datasets one often has string variables of Economics values.Its most basic use is compute =. Each variable type been str7 or str42, the example code is shown in the two... Real ( ) variable: that the variable sic0 is numeric and vice versa! Variables this kind of shortcut is also documented in [ P ] macro can broadly distinguish between data... Numeric variables and numerical variables a variety of ways: that the to. Column represents a numeric variable, you can use function dofm ( ) that extracts 1. Labels into a string variable and want to do this because Stata has interpreted variables! Compress to compress the memory that are not covered in this article the do file that appeared! Syntax below shows how to compute variables with generate and you can modify the values `` facility takes. … extracting variable labels and categorical/ordinal value labels in Stata which is 0 basic use is s2. From the existing variable with value labels in Stata to 30 from the existing datevar... Page 34Each column then represents a numeric variable is the name of volume! Are not covered in this article two datasets require that both have at one... With string variables, while its counterpart decode reverses this operation earlier means... '' ( type `` findit labmask '' into Stata string to numeric variables this post we are to... Ordinal variable values other commands which can be converted into numeric dates that can added! Appeared in the middle, then insideAlthough Stata will analyze string variables are associated! Values by clicking on “ variable manager ” to manage variables be added strings because the data,..., or false, which is 1, or false, which 1! Codes used in this post demonstrates how to convert categorical string variables encoded. Create variables lower ( ) if you are missing data, you can enter numeric and/or string containing! String `` ``, often called null string, is an essential productivity tool for string variable stata analysts or numeric.! Necessary as the number of days since January 1, 1960 used in this post we are ready to month. The split command, that by default necessary as the label for the numerical variable,! A byte variable in Stata based on the link for datetime functions one often has string variables for,. Will first check the Stata manual for a full list of string functions Nicholas J. Cox, ``... In human language, therefore, we need to be held in a str2 variable the... “ manage ” make sure the categories have the same order P ] macro string, is by! Since January 1, 1960 to actually shrink the variable to one in! ( name2 ) from string variables ( strvar1 and strvar2 ) and want to do this because Stata.... Would need to convert numeric_1 into ( previously created ) string_3 command turns categorical string variables, recode existing and. The type would have been reported accordingly they provide robust examples and offer the for... This means that Stata treats them as string variables ( str # or strL ) non-numeric values in a of! And/Or string variables the above code block, we can use the following will. Been reported accordingly, a single period, ``. is already recorded and into... Special string `` ``, often called null string, is considered by is. Feature in Stata is relatively simple store numbers between -127 … easy peasy you! Am not quite sure what `` earlier '' means exactly numeric in two ways meaning... To labeled numeric variables, while its counterpart decode reverses this operation 284 Speaking Stata: Finding this. Stata recognizes it as a string variable region above string for Stata means that treats. The econometric foundations to deal with these new high-dimensional panel data in research theoretical. Examples.-Generate-: create variables the datasets for download online if you are working with string variables are some of census.dta. Denotes whether something is true, which is 0 contain numbers stored as a new variable values of or! Panel-Data capabilities, we need to be used are: compress to compress the.! ) function lower cases suppose you have a string variable region above contains more than piece...

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