Remove leading and trailing whitespace from strings matlab. I have a list off agreement numbers but they have character and numeric values and i just want to extract the characters into a new column. Notice the use of the options generate and replace. You could then remove those ids from your string vars using if conditions, perform your routine below then bring back the nonalpha prefixed ids from your destring variable. Im trying to use reshape with a string variable, but my string variable contains special characters. Convert dta file to exceldownload free software programs.
Dec, 2012 removing first 3 letters from a string in spss. Alternatively, we can use the foreach command to achieve the same goal. On april 23, 2014, statalist moved from an email list to a forum, based at. Stata module to strip unwanted characters, statistical software. Stata is available on the pcs in the computer lab as well as on the unix system. Create a string array, and remove leading and trailing whitespace with the strtrim function. See the help on functions, particularly string function. How to remove the number of variable limitation on the stata kitchensink package. An online tool to trim the line numbers from the beginning of each row. In a stata training, one of the students wondered why after importing an excel file of financial indicators into stata some were read as strings. Data analysis with python and pandas convert string category to numeric values tutorial 6. Dec 06, 2011 when i copy data from excel, using commas as decimal separator, into the data editor, stata11 codes the numbers with commas as string variable. However, all our item numbers across the board are not all the same length so i cant just do a leftx to get the base item number. All, i am working on survey data, and my variable names are like question5doyouhave, question6areyou.
How can i quickly convert many string variables to numeric. How to remove the number of variable limitation on the. Then you can extract the first three digits using e. Reed college stata help changing string variables to. How to remove all of the contents of a string except the first character. How can i convert string variables to numeric variables in. Python removing unwanted characters from string the generic problem faced by the programmers is removing a character from the entire string. To concatenate is to join the characters of 2 or more variables from end to end. These identifiers should be read in and maintained as string variables. This document briefly summarizes stata commands useful in econ4570 econometrics. In a case where your string variables are in fact strings e. Useful stata commands 2019 rensselaer polytechnic institute.
Stata module to replace specific characters or strings in variable names andor variable labels andor string variable values andor value label names and levels with stated charactersstr, statistical software components s4577, boston college department of economics. While useful for a human eye, a computer cant glean much from data in this format. The first line of syntax reads in the dataset shown above. The module is made available under terms of the gpl v3. From a text string having more that one set of numbers see example below. Im fairly new to stata and i have data that i cannot seem to convert from strings to numbers. A quick performance test shows that this is about five. I have around 50 such similarly named variables i need to know whether there is a way i can specify that the number be removed from the variable name, and maybe if possible the question bit also.
Also using no commas at all in excel does not fix the problem. Date prev date next thread prev thread next date index thread index. This document briefly summarizes stata commands useful in econ4570 econometrics and econ6570 advanced econometrics. Assuming sic0 is a one digit numeric variable, you ought to use. I want to remove the leading 0 1 4 other numbers from this string and keep only. Starting in r2017a, you can create strings using double quotes. Working on firm level data again, i have the experience of cleaning up hundreds of different spelinngs of occupations that should eventually be categorized into a set of occupations that should only differ when actual different occupations are needed. But in my case, any characters can appear in my input string, and i only want to keep the characters that i want without messing up the order of course. As a beginner to stata, i was wondering if anybody could please offer some help. Any suggestions are greatly appreciated the line above is a sample of the excel items and after the check number shown there a number of invoice numbers in the text string. Mar 10, 2015 in a stata training, one of the students wondered why after importing an excel file of financial indicators into stata some were read as strings. An example of when one might need to do this is if they needed to append. If you have more than 67,784 unique values of the string variables that you are encoding, encode will complain.
A string variable shows up in red in the data editor. 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. How to remove the number of variable limitation on the stata. Convert dta file to exceldownload free software programs online. Replace to remove all numbers and signs from a string. This module may be installed from within stata by typing ssc install sdecode. In stata you can create new variables with generate and you can modify the values of an existing variable with replace and with recode. When i copy data from excel, using commas as decimal separator, into the data editor, stata11 codes the numbers with commas as string variable. Martin weiss does not subinstr work for string observation, and not variable names.
Stata module to decode a numeric variable into a string variable, statistical software components s417702, boston college department of economics, revised 30 sep 20. Therefore, stata offers tools to turn these date strings into values that, while still displaying sensical data to humans, are encoded in a numeric format that stata likes. Creating and recoding variables stata learning modules this module shows how to create and recode variables. In this number if the data before decimal point is less than means if 158 using namespace std. Stata module to strip unwanted characters ideasrepec. Then, in stata type edit in the command line to open the data editor. To create new variables typically from other variables in your data set, plus some arithmetic or logical expressions, or to modify variables that already exist in your data set, stata provides two versions of basically the same procedures. Command generate is used if a new variable is to be added to the data set. Nov 05, 2008 cleaning up messy string variables november 5, 2008 june 16, 2011 kriechel working on firm level data again, i have the experience of cleaning up hundreds of different spelinngs of occupations that should eventually be categorized into a set of occupations that should only differ when actual different occupations are needed. The following document provides an example of how to create. As example, suppose we have the variables var1, var2, and var3. Creating and recoding variables stata learning modules.
How to remove contents of string after a character. Often data is imported into stata with string format dates such as 10091986 or 9oct1986. Statas data management features give you complete control. This is common in geospatial analysis arcmap and the like the output is 530333039. May 14, 2017 this feature is not available right now. Black is for numbers, red is for text or string and blue is for labeled variables. Stata is a complete, integrated statistical software package that provides everything you need for data science. Mar 06, 2009 using question marks and stars in strings march 6, 2009 june 16, 2011 jan sauermann i just came accross the following problem. Keep only alphanumeric characters from character string sas. Missing numeric data should be coded as an empty cell, not a space, dot. Create a year variable from a string date variable if you have dates in whatever string format, such as 1792000, and you want a non string variable containing only the year, you first convert the variable into stata internal form sif, then extract the year. Changing string variables to numbers in stata youtube. In the following codes, we tell stata to do the same thing the computation.
In this number if the data before decimal point is less than means if 158 numbers that roll up to the same product family. You could then remove those ids from your string vars using if conditions. Cleaning up userentered string variables jeph herrin yale school of medicine yale university new haven, ct jeph. Login or register by clicking login or register at the topright of this page. Sep 08, 2016 the first line should have stata variable names 3. Data transformation reshape data cheat sheet get string. Using question marks and stars in strings statatex blog. Stata is a complete, integrated software package that provides all your data science needsdata manipulation, visualization, statistics, and reproducible reporting. Identifying and removing part of a string of text posted 08112010 48945 views i wasnt sure which forum to post this is, i need code that will work in information map studio andor enterprise guide.
How to extract few letters of a string variable in stata. In stata, this can be done by using either gen or egen. A quick browse at the data indicates the presence of hyphens and that these were used in different ways. Oct 05, 2010 to concatenate is to join the characters of 2 or more variables from end to end. Throughout, bold type will refer to stata commands, while le names, variables names, etc. The \d identifier simply matches any digit character. But sometimes the requirement is way above and demands the removal of more that 1 character, but a list of such malicious characters. For the latest version, open it from the course disk space. The following document provides an example of how to. 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. Using question marks and stars in strings march 6, 2009 june 16, 2011 jan sauermann i just came accross the following problem.
From what ive seen in other posts, if i actually know the unwanted characters, then i can do string. Remove leading and trailing spaces from string array. The first tabulate looks identical to the tabulate done on the string variable region above. You can do it with a linq like solution instead of a regular expression. Spssx discussion removing first 3 letters from a string in spss. When i use dots as decimal separator in excel and copy the data into the data editor, stata still codes it as string variable. Hi there, i have a simple query i want to execute and im finding it hard, as im new to this. In my view, it amounts to a slight abuse of varnames to fill them with the string of the question. I am trying to use the stata kitchensink package for a model with more than 10 independent variables. Remove leading and trailing whitespace from strings. Basics of stata this handout is intended as an introduction to stata. 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. Commas in numbers or text are particularly problematic because stata thinks.
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