Some uses and handy abuses of proc transpose ralph w. It can make values in the rows for a variable become new. This sas software tutorial shows how to use proc transpose to. Data transposition with proc report midwest sas users group. Proc sql a primer for sas programmers jimmy defoor citi card irving, texas the structured query language sql has a very different syntax and, often, a very different method of creating the desired results than the sas data step and the sas procedures. So, you need to use proc print, proc report, or some other sas reporting tool if you want to print the output data. Sas interview questions and answers pdf for experienced freshers. Sas users are unsure of the results it will give and curious about syntax that is often not particularly intuitive. For example, if prefixvar, then the names of the variables are var1, var2. Reshaping data from wide to long format sas blogs sas. If outputdataset does not exist, then proc transpose creates it by using the data n naming convention.
For a data set in wide format such as the one below, we can reshape it into long format using proc transpose. The transpose procedure can often eliminate the need to write a lengthy data step to achieve the same result. Proc transpose oder doityourself 1 einleitung saswiki. Because the proc transpose is given a by pageno parameter, the. Proc transpose is a powerful yet underutilized proc in the base sas toolset. This paper presents an easy beforeandafter approach to learning proc transpose. How to prepare for the sas certified specialist base programming exam. Sas tutorials summarizing dataset contents with proc contents search this guide search. When you use a numeric variable as an id variable, proc transpose changes the formatted id value into a valid sas name. Because the copy statement copies variables directly to the output data set, the number of observations in the output data set is equal to the number of observations in the input data set. Sometimes you need to reshape your data which is in a long format shown below famid year faminc 1 96 40000 1 97 40500 1 98 4 2 96 45000 2 97 45400 2 98 45800 3 96 75000 3 97 76000 3 98 77000. Transposing multiple variables in a sas data set within a single macro call. Proc transpose transposes only the numeric variables, test1, test2, and final, because no var statement appears. Its a very powerful procedure when you need to change the shape of the data.
Im answering the a2a when and why would you use proc transpose in sas, and what makes it so useful as a procedure. There is a summary sheet at the end of the paper as well for later reference. It contains three sample sas input files, a set of basic. If you have control over inputting your raw data and know how you plan to analyze the data you will probably n. For example, you have data in vertical long format and you are asked to change it to horizontal wide format.
Sas variable names cannot begin with a number unless you have set validvarnameany. Use proc print, proc report, or some other sas reporting tool to print the output data set. The proc transpose is part of the sas language that does not get used as much as it should. This sas software tutorial shows how to summarize a sas datasets contents and metadata using proc contents. From the first output of proc print, we see that the data now is in long format except that we dont have a numeric variable indicating year. Determining the number of observations in a sas da. Below is an example of using sas proc transpose to reshape the data from a long to a wide format. You already know that proc transpose changes the shape of your sas dataset. Although there is nothing wrong with this approach, i prefer to use the transpose procedure in a wide format, each subject is represented by one row and many variables. Here i am using the sample set we used for transposing and will untranspose it using same way uh we can use old data set yeah but i just want to show how can i do it with using proc transpose again. Out puts the result of the transposition in the idnumber data set. Learn about the powerful and seldom used proc transpose procedure in sas to transpose the data from rows to columns and vice versa. How to reshape data long to wide using proc transpose. A dataframe in pandas is analogous to a sas data set a twodimensional data source with labeled columns that can be of different types.
Proc transpose doesnt have all of the capabilities of proc transpose as it was designed for just one purpose. With sas, data transposition can be carried out in more than one way. Because the copy statement copies variables directly to the output data set, the number of observations in the output data set is equal to the number of. Leighton, the hartford, hartford ct sugi 27 advanced tutorials. Transposing data using proc transpose sas tutorials. Do you often need to transpose your data sets from long multiple rows per subject to wide multiple columns per subject. Proc transpose is an extremely powerful tool for making long files wide, and wide files less wide or long, but getting it to do what you need often involves a lot of time, effort, and a substantial knowledge of. Transposing data using proc transpose search this guide search. Proc transpose is a powerful data manipulation tool in base sas. The procedure pads the output data set with missing values if the number of observations in the input data set and the number of variables it transposes are. First step, it is required to sort the variables id time before using them in by statement in proc transpose. Using proc transpose to flip or restructure data by alan elliott. When and why would you use proc transpose in sas, and what.
This section discusses some applications of the transpose procedure relevant to time series data sets. If however two or more variables need to be transposed, you need to transpose each variable separately and then merge the transposed data sets, which can be time consuming. The transpose procedure can transpose variables and observations, or transpose variables and observations within by groups. As cat truxillo points out in her recent blog post, some sas procedures require data to be in a long as opposed to wide format. Transpose procedure 1512 chapter 62 the trantab procedure 1525. Delimiter delimiter specifies a delimiter to use in constructing names for transposed variables in the output data set. Further, the output data set can be used in subsequent data or proc steps for analysis, reporting, or further data manipulation. How to reshape data wide to long using proc transpose.
This sas software tutorial shows how to use proc transpose to transpose a datasets rows and columns, and discusses when to use a transpose. If specified, the delimiter will be inserted between variable values if more than one variable has been specified on the id statement. Visualizing proc transpose daniel boisvert, genzyme corporation, cambridge ma shafi chowdhury, shafi consultancy, london england abstract proc transpose continues to confuse programmers. Proc transpose for better listings view phuse wiki. Proc transpose transposes numeric variables by default. Sas proc transpose how to retranspose or untranspose. It contains three sample sas input files, a set of basic proc transpose variations, and their output results.
The ability to effectively transpose a data set is very important when working with different data structures and different data standards. Learn how to convert wide data into tall data with proc transpose. Sas proc transpose without needing to sort the data. How to reshape data long to wide using proc transpose sas. There may come a weird scenario when you have to retranspose or untranspose or transform from wide to long. To print the output data set from the proc transpose step, use proc. Identical data can bet arranged differently, often as wide or tall datasets. The proc transpose statement tells sas to execute the transpose procedure on an.
As will be shown in this document, almost any operation that can be applied to a data set using sass data step, can also be accomplished in pandas a series is the data structure that represents one column of a dataframe. Taming the proc transpose matt taylor, carolina analytical consulting, llc abstract the proc transpose is often misunderstood and seldom used. Transposing one group of variables for a data set in wide format such as the one below, we can reshape it into long format using proc transpose. It is very help ful when needing to shift data from rows to. Cat uses a data step to convert the data from wide to long format. Proc transpose variations, and their output results. The transpose procedure creates an output data set by restructuring the values in a sas data set, transposing selected variables into observations. If youve ever had to rearrange a transposed sas dataset, converting it from being a wide dataset back to the long or less wide. This tutorial explains the basic and intermediate applications of proc transpose with examples. The transpose procedure always produces an output data set, regardless of whether you specify the out option in the proc transpose statement. In the first transpose of the above code, we are telling sas to store information of all the variables in a single variable and the respective values in the another variable. When transposing it, all variables in the dataset are turned into records, and all the records subjects, or subject visits are turned into variables.