How do you create a macro variable in SAS DATA step?

How do you create a macro variable in SAS DATA step?

The %LET statement is one of the easiest methods to create a macro variable in SAS and is equivalent to the DATA step’s assignment statement. %LET statement is followed by the macro variable name, an equal sign (=), and then the text value assigned to the macro variable.

How macro variables are used in DATA step?

After a macro variable is created, you typically use the variable by referencing it with an ampersand preceding its name (&variable-name), which is called a macro variable reference. These references perform symbolic substitutions when they resolve to their value. You can use these references anywhere in a SAS program.

What does DATA Step do in SAS?

A SAS program consists of DATA steps and PROC (procedure) steps. DATA steps handle data sets, while PROC steps actually conduct analyses. A DATA step is used to create or modify data sets by creating and modifying variables; checking and correcting errors in data sets; and writing programs (for simulations).

What does %macro do in SAS?

%MACRO macro-name; macro-text %MEND macro-name; SUGI 29 Tutorials Page 4 4 The %MACRO statement tells SAS that this is the beginning of the macro and the %MEND statement signals the end of the macro. Macro-name is a name you make up for your macro.

How do you use %include in SAS?

Rules for Using %INCLUDE The %INCLUDE statement must begin at a statement boundary. That is, it must be the first statement in a SAS job or must immediately follow a semicolon ending another statement. The %INCLUDE statement can be nested within a file that has been accessed with %INCLUDE.

What is data step purpose of the data step?

The DATA step consists of a group of SAS statements that begins with a DATA statement. The DATA statement begins the process of building a SAS data set and names the data set. The statements that make up the DATA step are compiled, and the syntax is checked. If the syntax is correct, then the statements are executed.

What are macro variables?

Macro variables are tools that enable you to dynamically modify the text in a SAS program through symbolic substitution. You can assign large or small amounts of text to macro variables, and after that, you can use that text by simply referencing the variable that contains it.

What are the macro variables?

Is data step faster than PROC SQL?

The PROC SQL step runs much faster than other SAS procedures and the DATA step. This is because PROC SQL can optimize the query before the discovery process is launched. The WHERE clause is processed before the tables referenced by the SASHELP.

DO loops in data step SAS?

Iterative DO loops are the simplest form of DO loops that can be executed within a SAS Data Step. The actions of an iterative DO loop are unconditional, meaning that if you define a loop to execute 50 times, it will execute 50 times without stopping (unless an error occurs during processing).

DO loops SAS macro?

In the SAS Macro language, the main loop is a do loop. We can use do loops to dynamically create new data and variables in a loop. The syntax for a SAS macro do loop is shown below. One example of using a do loop would be if you have a list of words that you want to loop over.

  • October 22, 2022