Commonly when people convert data from excel and elsewhere their date is stored as a string. The other day someone posted the following question to the sasl discussion list. That will give you a list of values that stata did not destring and you can make the changes to the new variable as needed. In spss, to convert a numeric variable to a string variable, use the string function. One data manipulation task that you need to do in pretty much any data analysis is recode data. This holds especially when you want to do calculations on ordinal variables under the assumption of equal intervals. Doing so with syntax is way faster than with the menu, especially if you want to recode many variables at once. In r, you can re code an entire vector or array at once. 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. If playback doesnt begin shortly, try restarting your device. In a case where your string variables are in fact strings e. Reed college stata help changing string variables to.
Stata module to recode string variables according to. Then, we use recode to convert mpg3a into three categories. Thanks just in case anyone else having similar issue as me given data was meant to be numerical, however had been read in as strings because of the missing flag, i needed to add destring, replace after the above code to convert to numerical. In spss, how do i convert between numeric variables and. How can i quickly convert many string variables to numeric variables. How can i convert string variables to numeric variables in. Videos you watch may be added to the tvs watch history and influence tv recommendations. This post demonstrates how to create new variables, recode existing variables and label variables and values of variables. Any string in var that does not meet the conditions of rules is set to missing in. Married2 now let us recreate the married variable using the recode statement. Spss how to convert string variables into numeric ones. This will code m as 1 and f as 2, and put it in a new column. Values that do not meet any of the conditions of the rules are left unchanged, unless an otherwise rule is.
Suppose i have a variable for ethnicity and this is a text variable, and i would like to get a numeric variable out of it. Recode missing values coded with a string in stata stack. Creating and recoding variables stata learning modules this module shows how to create and recode variables. On one hand, it looks like an spss recode command to change the numerictext combos to string numerics plus an alter type command to convert the string variable to a. Title recode recode categorical variables descriptionquick startmenusyntax optionsremarks and examplesacknowledgmentalso see description recode changes the values of numeric variables according to the rules speci. Enter a new name for the autorecoded variable in the new name field, then click add new name. Stata module to decode a numeric variable into a string. In spss, recoding categorical string variables to numeric codes and converting blank strings to missing values can be done automatically using automatic recode. How can i turn a string variable containing dates into a date. Id drug id 1 d06662 2 d06665 3 d04878 4 d05048 now suppose d06662 is a drug for hypertension, which i want to code into 1, and all else. In some cases you may want to recode a string variable into a numeric one. I was planning on using the trim function but cannot figure out how to crop the first three letters off. Fortunately, stata offers some easy ways for converting string to numeric variables and vice versa. What youre looking for is a numeric storage type anything other than str and a date display format starts with %t.
Although the variable science is defined as str2, you can see from the list below that it contains just numeric values. Converting string to numeric variables is easy with destring help destring. How can i quickly convert many string variables to numeric. Written and illustrated tutorials for the statistical software spss. I found that there is a destring function, but this only works if the variables are already in a numerical format. The recode into different variables window will appear. If the string cannot be parsed as a number, then the systemmissing value is assigned instead. Converting string variables to numeric spss code fragments this shows how to convert a string variable race to a numeric variable racen using two methods, the first a bit simpler but more cumbersome, the second method more streamlined but a bit trickier. In the example above, a8 indicates a string variable eight. I have a variable state that takes integer values from 11 to 99. As you can see from the second tabulate, region2 has the numeric values 1 through 4 but retains the strings central, east, south and west as value labels. Note that youll often want to apply or adjust some value labels after recoding. If you have a string variable that has only numbers in.
Hi, everyone, i have a question regarding matching of nonnumerical values. Watch how to convert a string variable to a numeric variable. Creating an age variable from a date of brith variable. Spss will assign numeric categories in alphabetical order. Changing string variables to numbers in stata youtube. If you have a string variable and want to convert it to a numeric variable, you can use the encode command.
I tried to use if but it works only for one condition or for nested conditions, which is not my case. In stata, this can be done by using either gen or egen. Now lets use the encode command and another describe. Im new to stata and searching for a way to recode string variables yesno answers into numerical answers 10. Recoding string variable into numerical variable statistics. If, for example, you had a gender variable consisting of ones and zeroes that encoded as str1 and was therefore all numbers, you could use the destring command.
Apr 30, 20 commonly when people convert data from excel and elsewhere their date is stored as a string. Java how to design login and register form in java. How to convert categorical string variables to labeled numeric variables. Recoding a variable with first 3 characters of a s. In spss, recoding categorical string variables to numeric codes and converting blank strings to missing values can be done automatically. Select the variable you wish to recode by clicking it. How to generate a string variable out of a labeled numeric. Nov 16, 2016 hi there, i am looking to create a new variable that is a composite of the first three characters of a string variable they are names with an underscore and then an associated numeric variable. 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. Variables may either be recoded into numeric variables or into string variables.
The only step remaining is to label the new variable with a label var statement. How can i create a string variable statestring that would have string values without all those numeric values. To recode variables in stata, use the recode command. To illustrate, lets set up a vector that has missing values. I have a list of numeric ids for states stateid with abbreviated labels attached stname. Recoding both string and numeric variables in spss is usually done with recode. Hi there, i am looking to create a new variable that is a composite of the first three characters of a string variable they are names with an underscore and then an associated numeric variable. Change a string variable to a numeric variable duration. For a variable for example, q1 that contains integers ranging from 1.
Note that while using list, and some other data display commands, produces values that look like string dates, the actual values stored by stata are numeric. Data analysis with python and pandas convert string category to numeric values tutorial 6. To use recode, you must provide a list of variables to be recoded and the rules associated with that change. Stata module to recode string variables according to rules. Basic numeric to string recoding i am a new user please forgive me. Select the string variable of interest in the left column and move it to the right column. Even so, because the variable is defined as str2, stata cannot perform any kind of numerical analysis of the variable science. I came from stata and now i am trying to learn excel. The first tabulate looks identical to the tabulate done on the string variable region above. Even though stata can handly string variables, it is clear in many respects that numeric variables are much preferred. To recode into different variables, click transform recode into different variables.
Recoding a character variable as numeric the do loop. Nothing but guesswork leads to the syntax you tried. I am currently struggling to understand how to recode a variable. Since the default variable type in spss is numeric, you need to define your string variable in advance. The encode command has generated a new variable called region2 that is of type long integer and has value labels which are defined and are also called region2. Odd numbers of characters in string variables were soon allowed in stata 2. In the following example, cases where the value of x a string variable is the empty string, are recoded to 999 and all others are converted to the numeric equivalent of the input value.
I want to recode the string variable t into numerical variable, say t1, with values denoted in the corresponding parenthesis, and are replaced by the standard. To concatenate is to join the characters of 2 or more variables from end to end. Jul, 2017 convert variables from string to numeric in stata earnings management data. Converting string variables to numeric spss code fragments.
Here we use the generate command to create a new variable representing population younger than 18 years. Recoding text strings and then converting to numer. Cialis 40 mg, cialis price rprogramming online pill store. For a variable for example, q1 that contains integers ranging from 1 to 7, to collapse the values into three categories, use. Stata module to encode multiple string variables into numeric, statistical software components s456993, boston college department of economics, revised 21 jan 2009. The left column lists all of the variables in your dataset. Any string in var that does not meet the conditions of rules is set to missing in created numeric variables and copied from var in created string variables. Similarly, for gz variable, i want to construct a numeric variable gz1 with ny replaced by 01, respectively. My comments are basically the same as the other commenter. The output string variable may either replace the input numeric variable or be generated as a new variable named newvar. I was planning on using the trim function but cannot figure out how to. Creating and recoding variables stata learning modules. Recoding string variables automatic recode spss tutorials. The first line of syntax reads in the dataset shown above.
The results are placed into the numeric variable y. Lets say your date of birth variable is called dob. As example, suppose we have the variables var1, var2, and var3. On one hand, it looks like an spss recode command to change the numeric text combos to string numerics plus an alter type command to convert the string variable to a samenamed numeric f format variable. The second command formats the numeric value so that when stata displays the date, it is in a form that is easy for humans to read. We wish to run a regression of high blood pressure on race, sex, and age group. There is an easier way to recode mpg to three categories using generate and recode. Not least, most statistical procedures just do not accept string variables.
One method of converting numbers stored as strings into numerical variables is to use a string function. Its almost never the case that the data are set up exactly the way you need them for your analysis. Click the arrow in the center to move the selected variable to the center text box, b. As before, we look at the category values of the old variable with codebook, and summarize the old variable with a tabulate statement. Because you will likely use a dot with a numeric variable, stata will store these values as doubles to retain the correct numeric precision, requiring 8 bytes of. But when destring returns income contains nonnumeric characters. If you have more than 67,784 unique values of the string variables that you are encoding, encode will complain. Note that while using list, and some other data display commands, produces values that look like string dates, the actual values stored by. This tells you that there is a nonnumeric character in a variable that you expect to be all numeric, but it does not tell you what the character.
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