Apr 12, 2014 in destring complication, anup asked how to split a string variable. This article will introduce you to some of the most useful and easy to use features. Recode the marital variable into a string variable and then back into a numeric variable. The most important tool for working with groups is by. Encode a string variable in nonalphanumeric order stack overflow. His problem is how to extract the state, districts, etc. The first line of syntax reads in the dataset shown above. There is no limit to the number of variables in the varlist. This seminar covers stata commands and methods to prepare data for. The following document provides an example of how to create. This article is part of the stata for students series.
Lets illustrate use of the process using the high school and beyond dataset. You can click and drag the variables to reorder them within the sort by box. If the country name in the data differs from the country name in the command, stata will not run the command. Combining string variables alphabetically statalist. Jan 15, 2015 hi all, im trying to get tableau to understand that certain string fields are not simple categorical variables but are actually ordinal. To convert them into a stata date, an example code is shown in the second column. Besides, i dont want to do this manually, i want to generalize the. Reed college stata help changing string variables to. If you are new to stata we strongly recommend reading all the articles in the stata basics section.
The first case most often occurs when importing data from another source. In the following table, the first column shows different date formats in which the date is already recorded and brought into stata. As you can see, it tells us the number of observations in the file, the number of variables, the names of the variables, and more. You can download it by typing search labutil see how can i use the search.
Data sort description gsort arranges observations to be in ascending or descending order of the speci. Doubleclick on the variables you want to sort your data by to move them to the sort by box. How do i assign the values of one variable as the value labels for. An example of when one might need to do this is if they needed to append several variable sets together, and they needed a unique identifier the included information about the source data set. Then, for observations with common var1, stata will sort them according to var2. Then, for observations with common var1, stata will sort them according to. If we are inputting string character variables, precede the string. Unlike rowsort, sortrows operates on vectors, and is faster than looping through observations. It takes, as input, a string variable, and generates, as output, a numeric. If you map to a numeric variable, you can use value label definitions to insist on a different order. How can i turn a string variable containing dates into a date. Before we can use the stata timeseries or paneldata capabilities, we need to convert the string date to a stata date. 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.
Stata for complete beginners 100% free to download exercises and. Copying data from the internet, csv files, or other sources into stata will record the date as a string variable, shown with red color. In that case, you can relocate variables by using the order command with various options such as first, last, before, after, and alphabetic or sequential. In stata, this can be done by using either gen or egen. The following document provides an example of how to create string variables from numeric variables, and then concatenate string variables into one. Descriptive statistics give you a basic understanding one or more variables and how they relate to each other. The generated variable is obtained by sorting a variable provided as argument either in increasing order or based on a specified key variable. How do i sort values of string variable based on the order. This module should be installed from within stata by typing ssc install sortrows. Create a new variable that associates each individual with the average number of hours worked among individuals with matching educational degrees see the last by example for inspiration.
Missing numeric values are interpreted as being larger than any other number, so they are placed last with. If you are sorting by two or more variables, then the order that the variables appear in the sort by list matters. We are here to help, but wont do your homework or help you pirate software. How can i turn a string variable containing dates into a. Sometimes, for whatever reason, stata incorrectly calls a categorical variable a string variable.
If your strings contain unicode characters or you are writing programs that will be used by others who might use unicode. Remarks and examples gsort is almost a plugcompatible replacement for sort, except that you cannot specify a general varlist with gsort. When you sort on a string variable, however, null strings are placed first. Note that the lowest score is on the left in variable v1 and the highest score is on the right in variable v8. In preserving numerical format after string transformation, we used substr to generate a new variable that contains the first 2digits of a numerical code. It can sort both numeric and string variables, and allows for either the replacement of the existing variables, or the generation of a new variable list.
What command can i use to select variables containing. Openingsaving a stata datafile quick way of finding variables subsetting using conditional if stata color coding system from spsssas to stata example of a dataset in excel from excel to stata copyandpaste. Drop the records for the virgin island save this files in stata format. The user can tell ralpha to select random variates from a subset of the list of alpha characters using the range option. When i use tab command, it gives the result x freq. To concatenate is to join the characters of 2 or more variables from end to end. Functions accept an input and return some sort of output, so naturally.
The easiest way to tell if this is the case is to look at the variables window. The following document provides an example of how to. If there are 2 variables, var1 and var2, after sort, stata will sort the observations according to var1 first. If we wanted summary statistics for each ses group, we would need to use sort and then by as illustrated below. The length option can be used to generate random words as a string variable. We have transformed our numeric variable, code, into a string because, as we said, pemdas will not do the trick. 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. And, like the pythagorean theorem proofs, there are the very long ones, the shorter ones, and the one that is the most elegant of all. The dataset is marked as being sorted by varlist unless. A stata date is simply a number, but with the %td format applied stata will interpret that number as number of days since january 1, 1960. For example, understanding that a products ratings of high, middle high, middle low, low are ordered logically when presented as stacked bars and not just categorical names ie adam, beth, cathleen, daryl. It can sort both numeric and string variables, and allows for either the. In this example, a list of integers is defined, and then sorted is called with the numbers variable as the argument.
The program can be installed by typing the following from the stata command. How to group data in stata with sort and by youtube. Title sort sort data syntaxmenudescriptionoption remarks and examplesreferencesalso see syntax sort varlist in, stable menu data sort description sort arranges the observations of the current data into ascending order based on the values of the variables in varlist. Descriptive information and statistics stata learning modules. Even so, because the variable is defined as str2, stata cannot perform any kind of numerical analysis of the variable science. If the first argument is a string, then all the remaining arguments must be string also. 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. The describe command shows you basic information about a stata data file. Doubleclick on the variable s you want to sort your data by to move them to the sort by box.
This module may be installed from within stata by typing ssc install sencode. Var2 is a string variable even though you see numbers. In stata, we can use the command called labmask to create value labels for the. Stata news, code tips and tricks, questions, and discussion. Order variables alphabetically, not like aorder stata.
Create a log file, sort of statas builtin tape recorder and where you can. Stata, sort it by country by year since the variable risk premium is often missing, drop that variable. A string variable when sorted is necessarily in alphabetic order, or more generally the order given by the string characters used. Davids example allows you to keep variables according to the variable names, which is a different, but. It uses runiform to draw random numbers that are converted or assigned to a list of alpha characters azaz. In this example, a list of integers is defined, and then sorted is called.
Oct 05, 2010 to concatenate is to join the characters of 2 or more variables from end to end. How can i sort data within rows independently for each. Stata module to generate pseudorandom characters or. Stata module to row sort a set of integer variables. Hi all, im trying to get tableau to understand that certain string fields are not simple categorical variables but are actually ordinal. In destring complication, anup asked how to split a string variable. About asdoc asdoc is a stata program that makes it supereasy to send output from stata to ms word.
How to convert a string variable to a numeric variable duration. First off, its a rule in stata that string variables cant have value labels. Installation the program can be installed by typing the following from the stata command. I mean, in my dataset, i have a string variable x, which has 10 values such as a, b, c, etc. How can i quickly convert many string variables to numeric. If a variable is a string, the type will be str followed by some number.
In stata, how do i relocate variables with the order command. For instance, sort alphagamma means to sort the data in ascending order of alpha, within equal values of alpha. The sysuse command loads a specified stata format dataset that was shipped with stata. For example, criteriabased variable selection in regression analysis can be formalized as. Quick table for converting different dates to stata format. Although the variable science is defined as str2, you can see from the list below that it contains just numeric values. In the display below, sindicates a string subexpression a string literal, a string variable, or another string expression and nindicates a numeric subexpression a number, a numeric variable, or another numeric expression.
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