stata change variable type from string to numeric

; In the original string variable, the year, month and day may be separated by a dash (-), a slash (/), a period (.) Sometimes it might be necessary to change the data storage type of an existing variable: . So if 1/2/3 means 1 February 2003, use EDATE8 (dd-mm-yy). Often when importing data, Stata can mistake a numeric variable for a string variable. However, Stata does not actually shrink string variable types when you shorten their values. Numeric types 1.1 Stata provides five numeric types for storing variables, three of them integer types and two of them floating point. Calling in a data set. About Convert Numeric To Stata Categorical . Assuming that your string variable is called strvar a useful report is. With this two-step process, you can … We use variables of the census.dta data come with Stata as examples.-generate-: create variables. This is a very important feature, especially if a database from another source (e.g. 8 hours ago Convertf. *For each variable, flag conversion failures: cases where converted value is system missing but original value is not empty. type recode old-variable, and then generate new categories using a set of parentheses for each category. will ask Stata to change the storage type of variable income to "long". In this case, you want to convert the actual variable, not the format type (see here). Calling in a data set. GOAL: Learn about the two main types of variables that Stata uses: string and numeric. Copyright 2011-2019 StataCorp LLC. That is, a str6 type has a %6s format. After defining all Change numeric or string types. When coding these steps in Stata, users nd that Stata does not allow string values in matrices. The ability to use frames in Stata is arguably one of the most important features added to the software. I figured out the solution: turn it into a number of a type string and use the destring command. The first case most often occurs when importing data from another source. First, ordinal variables are converted using replace () one variable at a timeBinary nominal variables are converted using replace () one variable at a timeAll multiclass nominal variables are converted using get_dummies () at once I'd accomplish it as follows: encode. The cprdenttype package is intended for use with datasets produced by the cprdutil package to convert CPRD entity string data variables to numeric variables. I have two variables in Stata, both numeric variables that have somehow been recorded as string variables. A major pitfall: string variables. A float variable (or a double, according to set type) is created if the result is numeric, and a string variable is created if the result is a string. The "Properties" window gives us the same information as the above. The correct way to handle dates in Stata is to convert them to a number measured in days elapsed since January 1, 1960. In the latter case, if the string variable contains values greater than 2,045 characters or contains values with a binary 0 (\0), a strL variable is created. Title stata.com destring — Convert string variables to numeric variables and vice versa SyntaxMenuDescription Options for destringOptions for tostringRemarks and examples AcknowledgmentReferencesAlso see Syntax Convert string variables to numeric variables Let's call the variables "var1" and "var2". I'm fairly new to STATA and I have data that I cannot seem to convert from strings to numbers. Set the Precision and Scale if desired. Storage types are str6 and str13, and display formats are %9s and %13s, respectively. Convert String Variables that Contain Numbers to Numeric Variables. Other commands which can be used are: compress to compress the memory. The year, month and day variables in the example data set contain the same date as the others but in this format. where make1 is the new variable in the numeric form. String problems Stata. I want to drop string variable. ignoreopts may be aschars, asbytes, or illegal.The default behavior is to remove characters as characters, which is the same as specifying aschars. In any numeric variable … format to set output format. The first line of syntax reads in the dataset shown above. Inside each set of parentheses are four things: a list of all old variable category values with only spaces between the values, an equals sign, the new category value, and the new category label in double quotes. This distinction is important for reasons having to do with data storage. For tasks in analysis such as regression, Stata requires categorical variables to be stored as numeric variables, not string variables. At this point, we have successfully translated a string date into a numeric date. In SAS, converting a character variable to a numeric one uses the INPUT () function: var_numeric = input (var_char, best12. value and convert str containing 2006. A math or logical statement to set a value. I've tried converting some variables in a dataset of about 200K observations from string to numeric the following ways. \?" SPSS will assign numeric categories in alphabetical order. Another common scenario gives you dates as three separate numeric variables, one for the year, one for the month and one for the day. recast str25 variable20 Here, we asked Stata to convert the data storage type of our variable20 to a string with 25 characters. I am using R for my code. Run the compress command to actually shrink the variable types. The second line of code uses the date function to generate a new variable date2 from the existing variable datevar. The most basic distinction is that between continuous (or quantitative) and categorical data, which has a profound impact on the types of visualizations that can be used. In a later section, I will change the display format using format to make it readable. The first line of code converts the numeric variable to string variable. destring command can convert all character variables into numeric in one go. The maximum number of associations within each value label is 65,536. Click OK. Right-click the newly created field's header and select Field Calculator. In the latter case, if the string variable contains values greater than 2,045 characters or contains values with a binary 0 (\0), a strL variable is created. Read the Stata manual for a full list of string functions Back to beginning Matching and searching regexm(); regexr(); regexs() These are the We can do this in two main ways - based on its type and on its measurement levels. A wide range of choices for you to choose from. force specifies that any string values containing nonnumeric characters, in addition to any specified with ignore(), be treated as indicating missing numeric values. label define creates labels to each value of a numeric variable. gen rep78_str_num = real(rep78_str) converts the string variable rep78_str created above back to numeric again. string c1 to c4 (a7). Convert string variable to numeric. encode is also useful in reducing the size of a dataset. This means that the variable sic0 is numeric. Sometimes, for whatever reason, Stata incorrectly calls a categorical variable a string variable. See - help tostring - for more info. In fact, Stata understands a date and time variable as the difference from the base.The base (the numeric value 0) of a datetime variable begins at 01jan1960 00:00:00.000 (the first millisecond of 01jan1960); therefore “25jan2016 08:30:25” for us human beings will be 1769329825000 (milliseconds) for Stata. For Stata, red color means error, in this case it was expecting numeric variables but some values have letters attached so Stata reads them as string characters. The destring is one of the main commands used to clean databases in Stata, as it can be used to convert string variables to numeric variables. This answer is not useful. To be able to perform any mathematical operations, your variables need to be in a numeric format. Select the string variable of interest in the left column and move it to the right column. replace q1="1" if q1=="Female" destring q1, replace. String variables are best reserved for commentary data to assist the human observer. Converting string variables with numeric values. About Convert Numeric To Stata Categorical . The string variable must contain number characters, otherwise missing values will be generated. It distinguishes two types of data: numeric and string. Sometimes not everything goes smoothly. In order to convert these strings to binary codes, we can individually replace each string for each drug variable as follows: replace drugA="1" if drugA=="yes" replace drugA="0" if drugA=="no" Note, that 0 and 1 are enclosed in inverted commas since the type of all three drug variables is a string for now. alter type s1 to s3 (f1) s4 (f6.3). To convert such dates to Stata dates, use the mdy function. Almost exactly the way shown in your example. To convert from a numerical value to a string (change the “1” to a 1), use the –tostring– command. Model Specification. Show activity on this post. labels = … Note that to Stata the comma is a nonnumeric character; see also the dpcomma option below. will convert cntry to a numeric variable, with the characters from the former string variable as value labels. The destring command will only work if the string variable that we are trying to convert to numeric contains … Stata can store numbers with differing levels of precision, as described in the table below: I am using R for my code. Dummy Variable Stata Software. The default separator is a space character, however you can specify whichever separator you need to adequately split your variables. These are variables stored as text. A logical statement to limit cases , options. Closing Stata Choose eXit from the file menu, click the Windows close box (the 'x' in the top right corner), or type exit at the. The strings are things like "1000.62" and when I try using destring, replace, I am told that my variables contain non-numeric characters. *Convert variables to numeric. Say your current SAS file was called "have" and that you didn't want to risk messing it up, thus wanted to create a new dataset called "want". Stata can store numbers with differing levels of precision, as described in the table below. Horsepower should be numeric but is stored as a string (text). Model Specification. version 2.1.1 E Booth Jan2011 ** version 2.1.0 E Booth Oct2011 ** version 2.0.1 M Blasnik Sep03 ** version 2.0.2 M Blasnik, K Smith Mar08 program define nearmrg syntax [varlist(default=none)] using , /// Nearvar(varname numeric) [TYPE(str asis)] /// [LIMit(str asis) … if. When I tried, it said type mismatch I have tried the real and the encode commands, none of which are working. These pesky variables are red in the Data Editor window. Abstract. The real () function works on a single variable. Click on day in the "Variables" window. To convert from a numerical value to a string (change the “1” to a 1), use the –tostring– command. or even a combination of … The split command in Stata allows you to separate a string variable into multiple string variables. I Black text means number. String variables. 1.3 The integer types are byte, int, and long. Using Stata Help . Enter a new name for the autorecoded variable in the New Name field, then click Add New Name. Stata is statistical analysis software used commonly in social sciences. To automatically recode variables: Click Transform > Automatic Recode. They take up more memory and are not useful for your regressions, etc. If a numeric variable is stored as a string variable in Stata, we have several ways to convert them to numeric variables. indicates missing values in the original data, while stata recognize only \." And, you ets say that you didn't want to change the name. For example, you might want to use fewer, more aggregated categories than those used in collecting the data, change the ordering of a variable’s categories for some reason, or recode a quantitative variable as a categorical variable. Code: tab strvar if missing (real (strvar)) because that shows values of strvar that can't be converted to numeric simply. 1.4 … The storage type of variables can be changed with the help of the recast command. . If a numeric variable is stored as a string variable in Stata, we have several ways to convert them to numeric variables. Follow this answer to receive … If the string field contains only numeric values, use the following steps to copy the attributes to the numeric field: Set the Parser to VB Script. That’s it! Users can assign such a display recast long income. cprdenttype inputs an integer number, assumed to be a CPRD enttype (or entity type) value, and a filename, assumed to be a Stata dataset produced by the cprd_entity module of cprdutil, with one … I suspect you want to do this (but without seeing your variable names it's just guesswork): Code: forvalues i=1 (1)20 { tostring s`i', replace format (%2.0f) } Last edited by Chris Larkin; 25 Mar 2018, 16:33 . In SAS, convert numeric variable to string with leading zeros (assuming 10-digit fixed length) is done via PUT() function:. Type help command. However they can also be used for nominal or categorical data. Closing Stata Choose eXit from the file menu, click the Windows close box (the 'x' in the top right corner), or type exit at the. The easiest way to convert string variables to numeric form is to use the encode command. Before you can do much work with them they need to be converted into numeric variables. Download the program file here. You can convert the ordinal variable to numeric by providing a mapping for each unique value. Numeric types 1.1 Stata provides five numeric types for storing variables, three of them integer types and two of them floating point. recast to change storage type. destring — Convert string variables to numeric variables and vice versa 3 ignore(" chars ", ignoreopts) specifies nonnumeric characters be removed. 1.4 … Some data types such as dates have specific metadata attached – January 1, 1960 was a Friday – that relate to storage type. varlist 0, 1, 2 or more variables = exp . The first step is to use the .label define command to create a mapping between numeric values and the words or phrases used to describe those values. String to Date Syntax Notes. To convert from a numerical value to a string (change the “1” to a 1), use the –tostring– command. They take up more memory and are not useful for your regressions, etc. String variables that seemingly should be numeric require some care. Untuk memberi label pada variabel digunakan perintah : label variable. Stata Basics: Reshape Data. Stata will split the variable by a separator. Watch how to convert a string variable to a numeric variable. So format %-10s state would cause Stata to display the variable called state, aligned to the left … To convert those string characters into numeric you need to use destring command … Therefore, the categorical data must be translated into numerical data that can be understood by machine. destring. *Close data without saving and reopen before proceeding. Naturally you will need to use the name you have, which you have yet … strdate replaces a list of string date variables with a list of Stata numeric date variables having the same names, the same positions in the data set … This is necessary as the date function can work only on string variables. We might also need to convert a variable stored as a string to one that is stored as a numeric variable. To convert those string characters into numeric you need to use destring command … You can recognize these in the Data Editor because they will be colored red. Hello everyone! The split command in Stata allows you to separate a string variable into multiple string variables.

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