The reshape command can be used to reshape from wide to long or long to wide. Using stata on longformat data bowling green state. Most questions about its use can be answered from a careful reading of the manual entry at d reshape, but some further notes and examples are added here for the specific problem of reshaping e. The equivalent in the tidyverse would be the gather wide to long and spread long to wide. The issue is that i have two variables, but they arent both in the wide format. Stata module to enhance reshape for multilevel data, statistical software components s458437, boston college department of economics. Since we need to convert the data from a wide format to a long format, this is why the command that we wrote was reshape long. These examples take long data files and reshape them into wide form. Converting data from wide to long format using excel hindiurdu duration. Title reshape convert data from wide to long form and vice versa syntax menu description options remarks and examples stored results acknowledgment references also see syntax overview long wide i j stub i stub stub 1 1 4. You also must determine the logical observation i and the subobservation j by which to organize the data. Data transformation reshape data cheat sheet get string.
How to use stata to create and manage longformat data. For instance, logit or logistic model in stata prefers a wide. Convert data back to long form after using reshape wide reshape long. Stata commands greatly reduce the difficulty of accomplishing these tasks. Reshape wideform id sex inc80 inc81 inc82 1 0 5000 5500 6000 2 1 2000 2200 3300 3 0 3000 2000 longform id year sex inc 1 80 0 5000 1 81 0 5500 1 82 0 6000. If youve used stata you might be familiar with its reshape command.
Data preparationdescriptive statistics princeton university. After that, we have to specify the names of the variables which are in the wide format. Reshaping data wide to long stata learning modules. Most commands work the same in stata versions 12, 11, 10, and 9. Reshape the data long so that r and stata form their own columns and can be sorted by year hint.
In addition, we are often interested in combining multiple. Reshape a 4by4 square matrix into a matrix that has 2 columns. Here we suppose that jan through dec are stored in that order in your dataset. The stset command is used to tell stata the format of your survival data. These show common examples of reshaping data but do not exhaustively demonstrate the different kinds of data reshaping that you. 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. Two applicationsofreshape will again be needed to reach the target format. Secondlevel nesting description of advanced syntax seemitchell2010, chap. After that you specify the word kernel that the multiple columns we want to reshape have in common. When working with data in long format, be sure that there are no duplicate records per family or individual and that data are sorted correctly. How can i reshape without a unique j variable in stata.
These examples take wide data files and reshape them into long form. How to use the stata merge and reshape commands most of the projects done in 17. The stata reshape command apparently relies on this naming. How to reshape data in stata step 1 copy and paste data from csv to data editor in stata when copying data from csv to stata, make sure the var names are text. Reshaping data from wide to long university of virginia. In the above code, long tells stata that you want to restructure data from wide format to long format. Stata module to enhance reshape for multilevel data. Stata getting started tutorial department of statistics the. Data transformation reshape data manipulate strings with. Reed college stata help reshaping your data in stata. Specify for the first dimension to let reshape automatically. Baum department of economics boston college chestnut hill, ma 02467. Reshaping data long to wide stata learning modules.
Note that another column has been added to show the year. For example, if you type reshape long after you have reshaped the data to be wide, stata will revert the data. Codebooks are like maps to help you figure out the structure of the data. Panel data refers to data that follows a cross section over timefor example, a sample of individuals surveyed repeatedly for a number of years or data for all 50 states for all census years. An example of reshape long with stata1 stata has reshape long. You can use the reshape command to jump between long format.
Description of basic syntax before using reshape, you need to determine whether the data are in long or wide form. Stata has reshape long and reshape wide commands that make it pretty. Note that in the new format, there is a record for. Reshape matrix to have specified number of columns.
The text weight calories indicates the variables to be converted, and iid tells stata that id is. Hello everybody, i need to reshape wide data to long. There is an r function called reshape from the stats package that does the same thing, just not within the tidyverse framework. Preserving, reshaping and transferring data in stata. To reshape a wide data set long, you have to specify reshape long. Longitudinal data analysis using stata statistical horizons. These show common examples of reshaping data, but do not exhaustively demonstrate the different kinds of data reshaping that.
Convert data from wide to long or vice versa two forms of data. In addition, we are often interested in combining multiple observations. An example of reshape long with stata1 stata has reshape long and reshape wide commands that make it pretty easy to modify files from wide to long, and back. Because stata reads in the whole data set at the same time, stata has special commands to construct variables for data in long format. In stata, this method can be implemented with most regression commands using the vce option. Extracting and reshaping world fertility survey data in stata. The main stata interface is composed of five windows, listed clockwise from the center. Introduction to stata cosimo beverelli world radet. This entry describes this manual and what has changed since stata 12. Although the names are logical and clear, reshape can do nothing with such a variable set until these variables are renamed to a stub plus suffix form.
Like many other powerful commands, it can seem rather complicated until you have experience with it. Use the name of the program as a command as you use other default stata commands. These show common examples of reshaping data, but do not exhaustively demonstrate the different kinds of data reshaping that you could encounter. The other useful option is string which tells stata that the the variable specified in j is a string variable.
The tutorial starts with an excel spreadsheet sampledata. Suppose that you had the following data, which could be organized in wide or long form as. These show common examples of reshaping data but do not exhaustively demonstrate the different kinds of data reshaping that you could encounter. This module illustrates the power and simplicity of stata in its ability to reshape data files. Stata offers the reshape command for restructuring data.
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