If then statements in sas

The ELSE statement is optional. It can be used to execute a statement if the condition is not true.

An if-then statement can be used to create a new variable for a selected subset of the observations. For each observation in the data set, SAS evaluates the expression following the if. When the expression is true, the statement following then is executed. When the expression is false, SAS ignores the statement following then. For a person whose age is less than 65, the variable older will be missing. An optional else statement can be included if-then-else to provide an alternative action when the if expression is false.

If then statements in sas

Again, once you've read your data into a SAS data set, you probably want to do something with it. A common thing to do is to change the original data in some way in an attempt to answer a research question of interest to you. In the last lesson, we learned how to use assignment statements and functions to add some information to all of the observations in the data set. In this lesson, we will learn how to use if-then-else statements to add some information to some but not all of the observations in your data set. In this lesson, we investigate a number of examples that illustrate how to change a subset of the observations in our data set. In SAS, the most common way to select observations that meet a certain condition is to utilize an if-then statement. The basic form of the statement is:. For each observation, SAS evaluates the condition that follows the keyword IF — in this case, is the student's average less than 65? The condition always involves a comparison of some sort, and the action taken is typically some sort of assignment statement. There is nothing really new here. You've already seen an if-then -else statement in the previous lesson. Our focus there was primarily on the assignment statement. Here, we'll focus on the entire if-then statement, including the condition.

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I'm trying to solve a bug in my code where I have some if However, an email is being generated in both cases even though no warnings or errors are thrown. Any idea what I'm doing wrong? Here's an example that shows how to conditionally send an e-mail based on the values that you find in your data. View solution in original post. SAS has two kinds of statements. Think of them as being "lifted out" of a procedure.

The ELSE statement is optional. It can be used to execute a statement if the condition is not true. Sometimes, we might need to execute more than one statement when the condition is met. Sign In. Members' area. Master SAS in 30 days! Start Your Free Training Now. The data set above contains 10 students and their exam results. DO Group. The DO group starts with the DO statement.

If then statements in sas

Executes a SAS statement for observations that meet specific conditions. Global Statements by Category. Array Reference Statement. Assignment Statement.

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Others Others. Date last modified: January 6, SAS thereby avoids having to needlessly evaluate all of the remaining conditions. Denise 4. In addition to the comparison operators that we learned previously, we can also use the following logical operators : Operation SAS syntax Alternative SAS syntax are both conditions true? How behind the scene it works. Review the output from the PRINT procedure to convince yourself that the if-then-else statement that involves the creation of the variable action is inadequate while the one that uses the UPCASE function to create the variable action2 works like a charm. Cecil 3. You'll also need to make sure that your condition concerning missing values appears first in the IF statement, otherwise, SAS may bypass it. Note that this program also illustrates the use of more than one ELSE statement. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.

The expression is true if a non-zero or non-missing result is generated. Various statements control the flow of execution of statements within the data step. SAS evaluates the condition following the IF statement to determine whether it is true or false.

The operative words here are "either" and "or". Sign up. Now, let's look at our SAS program again, but this time having written the program so that SAS is told to assign status a missing value a blank space ' ' since it is a character variable if e4 is missing a period. Don't miss out on this exclusive offer. In addition to the comparison operators that we learned previously, we can also use the following logical operators : Operation SAS syntax Alternative SAS syntax are both conditions true? By including an else statement, we can tell SAS what to do if the condition following the IF keyword is false. Suppose our instructor wants to assign a grade of zero to any student who missed the fourth exam, as well as notify the student that she has done so. The following SAS program illustrates the use of alternative intervals as well as the alternative syntax for the comparison operators:. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Sign In. All of the if-then-else statement examples we've encountered so far involved only numeric variables. The value "Good standing" is not the same as the value "good standing". Let's go crazy and program a bunch of them!