Do loops in sas pdf example

This paper presents a number of examples to demonstrate how to take advantage of the %do loop to build sas statements dynamically. In this article, we will discuss differences between iterative do loops and conditional do loops. Moreover, we see three important types of loops in sas. Looprepeat algorithm this is the basic pseudocode of a looprepeat block. Loops in sas different loops in sas with their examples educba. How to use character values on a macro %do loop tree level 3. This paper will move the discussion of doloops in sas beyond only using them for. The sas statements are repeatedly executed till the until condition becomes true. Different languages use different keywords to define the iteration statement. The output statement is executed before the loop ends. The sas statements are repeatedly executed until the while condition becomes false. Each iteration reduces the value for the variable with. Included are examples of do and array statement shortcuts.

Place all sas data set variables into a macro variable tree level 3. Although most sas data step programmers have made use of do loops and arrays, few take. It can also be used to dynamically build a series of data steps or proc steps. Sas do index loop this do index loop uses a index variable for its start and end value. The sas statements are repeatedly executed until the final value of the index variable is. Use an array and a do loop in a new data step to count.

Running the same procedure against a series of data sets in previous examples, the % do loop is used to generate single sas statements. Loops are fundamental to programming because they enable you to repeat a computation for various values of parameters. We will look at many examples, including 1 input and output of files. Sas do loop, sas do while loop, and sas do until loop with their syntax and examples for. Sas do while loop this do while loop uses a while condition. A beginners guide to arrays and do loops sas institute. As shown in the next pseudocode example sas provides. Browse other questions tagged sas doloops or ask your own question. The following sas code will switch the data to long format and store it as a. Arrays are sas data step statements that allow iterative processing of variables and text. In this example, the do loop is executed when i1 and i2. A quick intro to sas arrays and do loops gopinath narasimhan saskatchewan cancer agency march 12, 2014.

Loops and arrays you want to know how many diagnoses are in. Loops in sas different loops in sas with their examples. Sas do until loop the do until loop uses a until condition. The whitlock sub setting loop also known as the do. Compare the iteration with the do until and do while examples. Using the iterative do statement without infinite looping. Do index, an iterative, or indexed, do loop used to perform the operations in the do loop at a. Macro examples using %goto are shown for continue and leave. In the above example, we declare a variable money initialized with a value of 0, the program loops through the counter loaded with an initial value of 0 to iterate over 10 times. Lets say you have a series of sas data sets class1 class10.

Do loop also knowns as iterative do loops are the most basic form of loops that are executed on a sas dataset in the sas data step. Sas arrays temporarily group and refer to sas variables. The whitlock sub setting loop also known as the do whitlock dow loop and doubledow are illustrated. In the above two examples we see that the do iterative will loop for every. In each of the following examples, the do group executes ten times. If you specify a while clause,the loop will execute as long as the while expression is true. Sas arrays a sas array is a set of variables of the same type, called elements of the arry, that you want to perform the same operation on. Using do statements, links, and arrays sas support. Array provides a different name to reference a group of variables.