When stata does this, the number will look right when you browse, but attempts to run commands will turn up zero observations. Reed college stata help reshaping your data in stata. Only the variable s format is changed, the values are not affected. Quick table for converting different dates to stata format. Before we can use the stata timeseries or paneldata capabilities, we need to convert the string date to a stata date. This is a case where we want to create value labels for the numeric variable based on the string variable. If you dont have a table of ascii codes handy, you can download. About asdoc asdoc is a stata program that makes it supereasy to send output from stata to ms word. I had a big dataset on prescriptions in patients in wide stata format. What kind of data formats does the archive distribute. How to convert numeric date to stata date stataprofessor. This module may be installed from within stata by typing ssc install strdate. The file extension should be changed from doc to do. Tostring string from a numerical variable there is no problem with negative signs.
Variables containing stringscalled string variablesoccur in data for a variety. Stata module to replace string date variables with. Even though stata can handly string variables, it is clear in many respects that numeric variables are much preferred. Microsoft scripting guy, ed wilson, talks about understanding windows powershell and basic string formatting. Github compress after converting string variables to strl github. Often when importing data, stata can mistake a numeric variable for a string variable. Stata plugins to java libraries that provide utilities for analyzing, parsing, andor working with string data more generally. In this case, you want to convert the actual variable, not the format type see here. The easiest way to tell if this is the case is to look at the variables window. Storing strings in the strl format can produce smaller dta files if strings have more than 8 characters and values are repeated. 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. From string to stata format this blog post discusses the conversion of text into stata date.
Recode the marital variable into a string variable and then back into a numeric variable. Working with dates in stata university of wisconsin. Spss string variables tutorial quickly master the basics and run some. For example, if you type reshape long after you have reshaped the data to be wide, stata will revert the data. We have transformed our numeric variable, code, into a string because, as we said, pemdas will not do the trick. Hello everyone, i am looking for the following, a magic command which would do something like this, it would create a string. If a variable is a string, the type will be str followed by some number. In this post, i would like to show how to convert a numeric date to stata date.
We wish to run a regression of high blood pressure on race, sex, and age group. The other useful option is string which tells stata that the the variable specified in j is a string variable. This article will introduce you to some of the most useful and easy to use features. Reed college stata help changing string variables to. How to count total number of string value occurrence per observation in stata. It seems that at times you pull off some really wild string formatting, and i have yet to see it documented very well.
How to count total number of string value occurrence per. The first case most often occurs when importing data from another source. Stata allows data to be entered directly through the keyboard with the input command, even when another dataset is already in memory. List of column names to convert to string columns to stata strl format. The syntax we use can be copypasted or downloaded here. Apr 12, 2014 in destring complication, anup asked how to split a string variable. However, i thought maybe it is possible to change the format afterwards.
How to create a date variable from a date stored as a string. Installation the program can be installed by typing the following from the stata command. Using functions we will describe below, you translate the original into the integers that stata understands and store those values in a new variable. How can i convert string variables to numeric variables in stata. How can i quickly convert many string variables to numeric variables. Although the variable science is defined as str2, you can see from the list below that it contains just numeric values. His problem is how to extract the state, districts, etc. Stata faq converting dates entered as strings into numeric dates that can be used by stata is relatively simple. You do the same thing to leftalign a numeric variable as you do a string variable. Lets type confirm variable again to see what happens if the variable iprovincestate is not in our dataset. It then alphabetizes that list and assigns numeric codes to each entry.
How to prepare panel data in stata and make panel data regression in stata. Import and export data in sas xport version 5 format 464. 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. Even so, because the variable is defined as str2, stata cannot perform any kind of numerical analysis of the variable science. Sometimes, for whatever reason, stata incorrectly calls a categorical variable a string variable.
Say that we have date variable in the following format and we want to convert it to stata format. There are two steps involved to convert the numeric variable to stata format. Here is one example where you need to preserve the numerical format for strings. Not least, most statistical procedures just do not accept string variables. Learn how to use the date function with this stata quick tip from chuck huber. You will have to download and install an excel odbc driver from microsofts website to work with excel files. 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. Within stata, suppose the problematic string variable is named foo.
Spss string variables quick introduction spss tutorials. Show 10digit v1 as whole numbers with commas format v1 %15. But stata records missing values as a single period. Once you have read this post, then you can read another post that lists a quick table of dates conversions from one frequency to another. Stata 11 introduced a variables manager that allows editing variable names, labels, types, formats, and notes, as well as value labels, using an intuitive graphical user interface available under datavariables manager in the menu system. The first line of syntax reads in the dataset shown above. To leftalign the variable state i manually inspect the storage type to identify the length and then change the display format. Fortunately, stata offers some easy ways for converting string to numeric variables and vice versa. A string representing a categorical variable stata. While the manager is certainly convenient, i still prefer writing all commands in a do file to ensure. This can be useful to add data that may not be used in the ensuing statistical analysis, such as graphing data.
The stata blog import covid19 data from johns hopkins. Stata module to split numeric variable into components, statistical software components s447901, boston college department of economics, revised 26 feb 2011. Suppose you have a 6digit numeric observation id, code, where the first 2 digits represent geographic code and the last 4 digits represent unique observation codes, and you want to generate a new variable, reg, that represents the 2digit geographic code. We will download real data in their original formats and we will proceed from. Stata module to convert a matrix to variables in an output dataset, statistical software components s457018, boston college department of economics, revised 11 apr 2020. Stata module to convert a matrix to variables in an. 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. How can i turn a string variable containing dates into a date. The default download settings indicate missing values with two periods, like so. First, use describe to reassure yourself that it is a string. The easiest way to convert string variables to numeric form is to use the encode command. All these columns will import as string values when they should be numeric, because of the missing values, so you wont be able to make any calculations without fixing the data. Although it seems like region is a string variable, it is really a numeric variable with an attached value label. Title, converting other format files into stata dataset files.
We primarily distribute data files in eight data formats. In preserving numerical format after string transformation, we used substr to generate a new variable that contains the first 2digits of a numerical code. How can i turn a string variable containing dates into a date variable stata can recognize. How to convert categorical string variables to labeled numeric variables. Stata module to split numeric variable into components. You specify the appropriate display format for the new variable so that, rather than displaying. Understanding powershell and basic string formatting. Copying data from the internet, csv files, or other sources into stata will record the date as a string variable, shown with red color. Usually, when we import data manually into the stata editor, the dates. How can i quickly convert many string variables to numeric.
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