Thus, if we run the following simple proc transpose step. Most of the time, youll need to make modifications to your variables before you can analyze your data. For more information, see statements with the same function in multiple procedures. Using sql within sas, author howard schreier illustrates the use of proc sql in the context of the sas data step and other sas procedures such as sort, freq, means, summary, append, datasets, and transpose whose functionality overlaps and complements that of sql. How to reshape data wide to long using proc transpose sas. Im wondering if anyone knows a way to transpose multiple variables while pairing them based on the original dataset. Specify a variable whose values name the transposed variables. A concrete example of the start data and the transpose used would help. Taming the proc transpose sas proceedings and more. Visualizing proc transpose sas proceedings and more. Sep 21, 2014 3 proc transpose in sas for long and wide format conversion data samp. The syntax for the proc tranpose is somewhat misunderstood amongst sas users. You can use the attrib, format, label, and where statements. Proc transpose as sas documentation says, the transpose procedure can often eliminate the need to write a lengthy data step to achieve the same result.
How to reshape data long to wide using proc transpose sas. In this section we will detail all of the features of the proc transpose. The proc transpose code can be much simpler than the corresponding code in the data step, however it also has an important disadvantage. Another design aspect was to use named parameters that were identical to proc transpose s statements and options. For a data set in wide format such as the one below, we can reshape it into long format using proc transpose. The dataset we will use for our examples consist of a modifiedsimplified version of a standard sample dataset provided with most sas installations, sashelp. Use a libname statement to assign a library reference name to a sas library. 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.
In the first step of the process, proc transpose was used to make the wide. The transpose procedure transposes selected variables into observations. The report procedure is widely used in generating reports which include. Stuelpner, janet, the transpose procedure or how to turn it around, sugi 31, paper 234.
You can find multiple examples in the sashelp library to help illustrate what a long dataset looks like. Supports the output delivery system see chapter 2, fundamental concepts for using base sas procedures reminder. For a list, see dictionary of sas global statements in sas global statements. For example, you have data in vertical long format and you are asked to change it to horizontal wide format.
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. A transposed variable is a variable the procedure creates by transposing the values of an observation in the input data set into values of a variable in the output data set. If you have ever had to rearrange a sas dataset, converting it from being a tall. Investigate sas data libraries using base sas utility procedures. It is probably a little unorthodox when compared with other procedures that analysts use. For more information, see indatabase processing for proc transpose. Selects observations from a sas data set that meet certain conditions before sas brings them into the data or proc step for processing. A quick introduction to the powerful report procedure. This tutorial explains the basic and intermediate applications of proc transpose with examples. The proc transpose statement tells sas to execute the transpose procedure on an existing dataset called datasetname. See chapter 3, statements with the same function in multiple procedures, for details.
However, if you use the let option in the proc transpose statement, then the procedure issues a warning message. 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. When completed, we expect that you will also agree that proc transpose has value as another tool in your sas tool kit. It contains three sample sas input files, a set of basic proc transpose variations, and their output results. Apr 06, 2020 specifies the variable that proc transpose uses to form by groups. 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.
Use proc print, proc report, or some other sas reporting tool to print the output data set. The out keyword says that the transposed dataset should be created as a new dataset called newdatasetname. Proc transpose provides the ability to go from a long dataset where there are multiple rows for a given subject to a wide dataset where there are multiple columns for a subject. When i transpose this dataset it creates a dataset with 2. The transpose procedure the trantab procedure the univariate procedure p a r t 3 appendices sas elementary statistics procedures operating environmentspecific procedures raw data and data steps alternate ods html statements for running examples in different operation environments index. There is a summary sheet at the end of the paper as well for later reference. This sas software tutorial shows how to use proc transpose to. The primary objective of a sas programmer is often to perform a statistical analysis of some data. For example, you have data in vertical long format and you are asked to change it. These types of modifications can include changing a variables type from numeric to string or vice versa, merging the categories of a nominal or ordinal variable, dichotomizing a continuous variable at a cut point, or computing a new summary variable from existing variables. Investigate a library programmatically using the contents procedure. The ability to effectively transpose a data set is very important when working with different data structures and different data standards. Obs centre subjectno gender visit sbp wt 1 1 1 female a 121. Performing data extraction from various repositories and preprocess data when applicable.
The % transpose macro offered in the tabachneck et. I created a count variable to reshape the data using proc transpose, but i cant. If you do not use the notsorted option in the by statement, then either the observations must be sorted by all the variables that you specify, or they must be indexed appropriately. Using a sidebyside approach, this concise reference guide includes many extensively explained examples. 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.
Its a very powerful procedure when you need to change the shape of the data. Suffix needed for proc transpose to take a slightly different viewpoint, while have the ability to add suffixes would be nice, variables with suffixes are harder to work with in groups and i am not aware of being able to specify the colon operator as a leading wildcard as in. 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. Aug 08, 2019 sas base programming a00231 certification a00231 practice test and preparation guide. You can use the label, attrib, format, and where statements. 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. Transposing data using proc transpose sas tutorials. In sas, the transpose procedure can perform simple transposes, widetolong, and longtowide restructuring of datasets. Q1 q2 q3 q4 a 1 2 3 4 b 1 2 3 4 c 1 2 3 d 1 2 e 1 2 3 4 i have data like above and would like to import and reshape the data into what it looks like. Pharmasug 2015 paper tt12 proc transpose for fun and profit. Create an output data set by restructuring the values in a sas data set, transposing selected variables into observations. Introduction the proc transpose is part of the sas language that does not get used as much as it should.
That is only one variable can be transposed at a time if we want. The transpose procedure creates an output data set by restructuring the values in a sas data set, transposing selected variables into observations. Only a very thorough manual, such as the sas guide to the. This function if achieved in a data step can be much more cumbersome to code. Furthermore, we may need our data to be arranged in a particular format in order to use a specific analysis or procedure. For each by group in the original data set, proc transpose creates four observations, one for each variable that it is transposing. 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. This paper will provide a non technical approach to understanding the transpose procedure by showing the programmer how to visualize the expected output.
The proc transpose is part of the sas language that. Syntax conventions for the sas language tree level 1. Below is an example of using sas proc transpose to reshape the data from a long to a wide format. Transpose the data by defining age as an across variable. I have a file organized by id number with information about coursework and the institutional affiliation of each course. A number of alternative methods have been proposed, including writing datasteps, using other procedures like proc sql and proc summary, and running macros that were designed as proc transpose alternatives, but almost all of the. The proc transpose can save time and complexity once it is properly explained. This paper presents an easy beforeandafter approach to learning proc transpose. Chapter 2 fundamental concepts for using base sas procedures 17 language concepts 17 procedure concepts 20 output delivery system 33. Hi thomas, an often posed question and discussed subject on sas l.
The correct bibliographic citation for this manual is as follows. 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. To print the output data set from the proc transpose step, use proc print, proc report, or another sas reporting tool. Proc transpose to issue a warning message and stop. Suppose you have obtained the data presented below from a multicenter study, where each patient is identified by the means of the two variables centre and subjectno. An easier and faster way to untranspose a wide file. The transpose procedure always produces an output data set, regardless of whether you specify the out option in the proc transpose statement. Nov 24, 2008 creating the ad hoc reports using the sas procedures and used ods statements and proc template to generate different output formats like html, pdf and excel to view them in the web browser. It is very helpful when needing to shift data from rows to columns or vice versa. Missing values appear for the variable measurement renamed from col1 when the variables that are being transposed have no value in the input data set for that by group.
1242 299 706 1487 683 19 709 456 48 1412 1572 1117 367 266 1582 1577 53 1154 1270 727 1309 544 34 763 538 1309 1038 1556 697 460 1080 322 1244 14 1304 1274 802 906 749 313 1320 924 1161 1345