The transpose procedure can transpose variables and observations, or transpose variables and observations within by groups. Transposing data using proc transpose search this guide search. To print the output data set from the proc transpose step, use proc. To create transposed variable, the procedure transposes the values of an observation in the input data set into values of a variable in the output data set. Besides these two, this paper also introduces a third way, proc. 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. For a data set in wide format such as the one below, we can reshape it into long format using proc transpose. Some uses and handy abuses of proc transpose ralph w. This tutorial explains the basic and intermediate applications of proc transpose with examples. Use proc print, proc report, or some other sas reporting tool to print the output data set. Sas interview questions and answers pdf for experienced freshers. Do you often need to transpose your data sets from long multiple rows per subject to wide multiple columns per subject.
When you use a numeric variable as an id variable, proc transpose changes the formatted id value into a valid sas name. This tutorial explains the basic and intermediate applications of. Thus, when the first character of the formatted value is numeric, the procedure prefixes an underscore to the value, truncating the last character of an 32character value. If outputdataset does not exist, then proc transpose creates it by using the data n naming convention. Youve now got the data in a sas data set, but each month is in a separate column or variable. For example, if prefixvar, then the names of the variables are var1, var2. Dont understand your input data, and that end up in your proc transpose but anyway, as anca said, you need to take care of the date somehow, make it sas dates, so you could use sas functionsformats to do some smart date manipulations. Proc transpose is a powerful data manipulation tool in base sas. It is very help ful when needing to shift data from rows to. Sas functions byten returns one character in the ascii or ebcdic collating sequence where n is an integer representing a specific ascii or ebcdic character. Transposing data using proc transpose exploring data. Sas data set terminology variables columns in a sas data set. 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. The transpose procedure always produces an output data set, regardless of whether you specify the out option in the proc transpose statement.
Sas proc transpose without needing to sort the data. Write a proc ttest statement within the macro that outputs three datasets. You could plot 12 overlapping lines against year, but we really want them all together as 1 long timeseries line. The ability to effectively transpose a data set is very important when working with different data structures and different data standards. This video guides you through the process of using proc transpose to convert a narrow table to a wide table. This paper presents an easy beforeandafter approach to learning proc transpose.
Sas users must take specific actions to view the contents of a dataset. Transposing data using proc transpose sas tutorials. Proc transpose variations, and their output results. Data step and proc transpose are the two most common methods. Hi thomas, an often posed question and discussed subject on sasl. How to prepare for the sas certified specialist base programming exam. 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. Below is an example of using sas proc transpose to reshape the data from a long to a wide format. 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 proc transpose variations, and their output results. Numeric data values that are treated as numeric and may include 8 bytes of floating storage for 16 to 17 significant digits. The proc transpose is part of the sas language that does not get used as much as it should. The transpose procedure can often eliminate the need to write a lengthy data step to achieve the same result.
After the procedure, all of the info from each patient were listed in one single row. 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. Selects observations from a sas data set that meet certain conditions before sas brings them into the data or proc step for processing. Transposing multiple variables in a sas data set within a single macro call. Transpose will be deconstructed into three simple movements. Using proc compare and other helpful tools deb cassidy ppd, morrisville, nc abstract there may be many reasons to compare datasets including working in a doubleprogramming environment, determining if your code revisions worked as expected, and determining the impact from raw data updates. How to reshape data long to wide using proc transpose sas. So lets transpose the data, and make the months become values, rather than variables. In sas, i have a data set similar to the one below. The sas has created this credential to assess the knowledge and understanding of a candidate in the area as above via the certification exam. If specified, the delimiter will be inserted between variable values if more than one variable has been specified on the id statement. Proc transpose transposes numeric variables by default. It can make values in the rows for a variable become new. This sas software tutorial shows how to use proc transpose to transpose a datasets rows and columns, and discusses when to use a transpose.
Data transposition with proc report midwest sas users group. Transpose procedure 1512 chapter 62 the trantab procedure 1525. However, sas variable names cannot begin with a number. This course is part of a series by the sas institute, designed to prepare you for the sas 9. How to reshape data wide to long using proc transpose. As you can see, the patients info were listed in multiple rows prior to running the proc transpose procedure. First, lets see what happens when you use proc transpose on sashelp.
First step, it is required to sort the variables id time before using them in by statement in proc transpose. The transpose procedure creates an output data set by restructuring the values in a sas data set, transposing selected variables into observations. This sas software tutorial shows how to use proc transpose to transpose a datasets rows and columns, and. Visualizing proc transpose daniel boisvert, genzyme corporation, cambridge ma shafi chowdhury, shafi consultancy, london england abstract proc transpose continues to confuse programmers. Determining the number of observations in a sas da. Leighton, the hartford, hartford ct sugi 27 advanced tutorials. The proc transpose statement tells sas to execute the transpose procedure on an. With sas, data transposition can be carried out in more than one way. Data transposition with proc report lingqun liu the university of michigan, ann arbor abstract transposition is a very common data manipulation task.
Delimiter delimiter specifies a delimiter to use in constructing names for transposed variables in the output data set. If youve ever had to rearrange a transposed sas dataset, converting it from being a wide dataset back to the long or less wide. 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. Taming the proc transpose matt taylor, carolina analytical consulting, llc abstract the proc transpose is often misunderstood and seldom used. This section discusses some applications of the transpose procedure relevant to time series data sets. It contains three sample sas input files, a set of basic.
Proc transpose can be used to rotate transpose sas data sets. How to turn rows into columns in sas university edition. Character data non numeric data values such as letters, numbers, special characters, and blanks. To print the output data set from the proc transpose step, use proc print, proc report, or another sas reporting tool.
The sas base programming a00231 certification exam contains a high value in the market being the brand value of the sas attached with it. For example, you have data in vertical long format and you are asked to change it to horizontal wide format. Proc transpose free sas tutorials sascrunch training. 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. You already know that proc transpose changes the shape of your sas dataset. Proc transpose is a powerful yet underutilized proc in the base sas toolset. Proc transpose doesnt have all of the capabilities of proc transpose as it was designed for just one purpose. 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. How to reshape data long to wide using proc transpose. Its a very powerful procedure when you need to change the shape of the data.
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