Splitting a string variable in stata, and placing values. We will show some examples of how to use regular expression to extract andor replace a portion of a string variable using these three functions. By default, sort the file by grouping variables is selected. Since you really are not using the state variable as a numeric, convert it to a string. A string variable will be promoted whenever it gets too long as the result of a replace,subject to the upper limit associated with your executable in statase 7. I tried to split string but am not able to get it to do this. For most purposes in stata the monthly date variable is likely to be what you need, not the separate month and year variables. Several stata commands are used to process value labels. Stata module to list characters present in string variable, statistical software components s430301, boston college department of economics, revised 04 mar 2014. This is despite of the fact that substr turns into blue in the do file confirming that software has. Search for string in variable names and labels 451.
Mathworks is the leading developer of mathematical computing software for engineers and. I want to create a graph that would have the product description values on the yaxis. How to extract few letters of a string variable in stata. 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. Data management for statistical applications refers not only to classical data managementsorting, merging, appending, and the likebut also to data reorganization because the. Substitutei2,char, this removes the line breaks and then the rest can be done with statas split command. If odk or surveycto is used for data collection, the multiple response variables are downloaded as string variables. Split multicolumn variables in table or timetable matlab. But today i found a more convenient way of splitting numbers by using nsplit dan blanchette. The first line of syntax reads in the dataset shown above.
However, in my case, i have trouble reorganizing the order of these values. How to split a string variable into three parts, substr. Often datasets are split into multiple files, perhaps because data are collected in several waves or by different researchers. My variable of interest is patent publication numbers as followings.
Stata modules for splitting string variables into parts. String processing is fairly easy in stata because of the many builtin string functions. How can i convert string variables to numeric variables in stata. In fact, substr is all you need if you only need a part of a string, e. For example, if i want to split the philippine standard geographic codes psgc into smaller geographical units, i would write the following codes see note below. In order to split the file, spss requires that the data be sorted with respect to the splitting variable. I need to split the date nov93 into two columns nov and 1993 separately. I guess in the raw data, for each cell, there were multiple lines. Indeed, under favourable circumstances if the data constitute a simple random sample, the statistics that characterize samples say, the mean of a variable, or the proportion of cases with a property of interest are at the same time the best estimates for the parameter of the population. The easiest way to tell if this is the case is to look at the variables window. Dan blanchette additional contact information dan blanchette.
We can rely on stata to work out the appropriate string type when it replaces plaintiff by the desired string. The variable represents a list of characteristics associated with an observation and looks like this. Substitutei2,char, this removes the line breaks and then the rest can be done with stata s split command. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Hi, i have a variable that i want to do two things with. These were created by the person pressing altenter i. The file i was given is a dataset with a string that has over 50k characters. What command can i use to select variables containing specific pattern in stata. The reason why i dont want to use split is because afaik split breaks the string based on a parsing character. I have a question about splitting a string variable. User account menu extracting words from a string variable using a local list. Logistic regression analysis with a continuous variable in the.
What command can i use to select variables containing. For example, you want to make a new variable and know you can use the compute command to create a new variable in spss, but what is the equivalent or similar command in stata. So basically i want to take x and make two new variables variable x2 has only the last character of x and variable x1 has all but the last character of x. I need to split it into a new variable which contains only the city name. How to split a string variable into three parts, substr is not working 20 sep 2016, 07. How can i quickly convert many string variables to numeric variables. His problem is how to extract the state, districts, etc. If a variable is a string, the type will be str followed by some number.
The carolina population center, uncch statistical software components from boston college department of economics. How to use the split file tool in spss to split your data file by a categorical variable. Splitting character strings i have got this problem which must be fairly easy to solve. Therefore i need to split the variable down before i can completely clean it i have successfully called it onto xml but it was only 17k long. Variables in the input table, specified as a character vector, cell array of character vectors, string array, numeric array, or logical array. Splitting a string variable in stata is generally easy to do. Spssx discussion variable with values separated by commas. Stata module to split numeric variable into components. The easiest way to convert string variables to numeric form is to use the encode command. In stata, this can be done by using either gen or egen.
In his case, he has a variable of the form 28180018021832ob where 28 represents state code, 18 represents districts code, 0018 represents subdistricts code and 02183100 represents village code. I have a variable in my data file that contains six individual fields, each separated by commas. On april 23, 2014, statalist moved from an email list to a forum. I have list that the variables are string called id that is 7 digits long. How can i extract a portion of a string variable using. Although the variable science is defined as str2, you can see from the list below that it contains just numeric values. When i browsed the data, in the original string variable that was to. Estimation means drawing conclusions from samples about the underlying populations. Basically using this formula in the raw excel data. If you copy and paste into the data editor, say, under windows by using the clipboard, but data are spaceseparated, what you regard as separate variables will be combined because the data editor expects comma or.
Even so, because the variable is defined as str2, stata cannot perform any kind of numerical analysis of the variable science. In this example, i split my file by gender so that i can analyse data for males and females separately. As example, suppose we have the variables var1, var2, and var3. To concatenate is to join the characters of 2 or more variables from end to end. We are here to help, but wont do your homework or help you pirate software. I have a single numeric variable that identifies the citycountystate for each case, where the first three. Among these string functions are three functions that are related to regular expressions, regexm for matching, regexr for replacing and regexs for subexpressions. Sometimes, for whatever reason, stata incorrectly calls a categorical variable a string variable. Split your data file by a categorical variable in spss. By the way, there are actually three similar stata commands, generate, replace and egen.
Press question mark to learn the rest of the keyboard shortcuts. Would you let me know stata commends to deal with it, please. Statistical software components from boston college department of economics. Product code is numerical and product description is a string variable. If the variable is actually a numeric value that just happens to be stored as a string, see our faq. Creating a grouped variable is part of the methodology institute software tutorials sponsored by a grant from the lse annual fund. I want to createthree the variable containing the first three words in var. The first case most often occurs when importing data from another source. For a very long time i have used the string function substr to split all sorts of codes into components. When you no longer want to split your analyses by group, you can turn split file off through the same window you used to turn it on. Stata modules for splitting string variables into parts, statistical software components s424101, boston college department of. Thanks for contributing an answer to stack overflow. Say that you use spss but wish to know how to do a particular command in stata.
A little of the history of split is documented at d split. Splitting given string into two variables php stack. Splitting a string variable in stata, and placing values in order. How can i quickly convert many string variables to numeric. However, the variable itself is over 50k characters long. How shapeways software enables 3d printing at scale.
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