How do you set a variable value in SAS?
In SAS, you do not have to declare a variable before assigning a value to it. The variable is automatically declared the first time you specify it in an assignment statement. SAS assigns the variable’s type and length based on its first occurrence in the DATA step.
How do I create a macro variable in SAS dataset?
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 do I create a numeric macro variable in SAS?
Knowing how to create and use macro variables is the first step in learning the SAS Macro Language. One of the primary techniques is through the %LET statement. Other ways of creating macro variables includes the use of the iterative %DO loop, macro parameters, the SQL INTO: clause, and the DATA step SYMPUT routine.
How do I reference a macro variable in SAS?
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.
How do you keep variables in SAS?
The KEEP= option tells SAS which variables you want to keep in a data set. If you place the KEEP= option on the SET statement, SAS keeps the specified variables when it reads the input data set.
How do I create a local macro variable in SAS?
Use the %LOCAL statement to ensure that macro variables created earlier in a program are not inadvertently changed by values assigned to variables with the same name in the current macro. If a local macro variable already exists and you specify that variable in a %LOCAL statement, the existing value remains unchanged.
Which macro statement is assign value to variable?
The %LET statement is the easiest/simplest way to define and assign a value to a macro variable. The syntax is %LET macro- variable =; The macro-variable is either the name of a macro variable or a text expression that produces a macro variable name.
How do you define a macro variable?
The process to redefine a Macro is:
- Macro must be defined.
- When, you want to redefine the Macro, first of all, undefined the Macro by using #undef preprocessor directive.
- And, then define the Macro again by using #define preprocessor directive.
What is macro value?
A macro value is a sequence of characters. A macro value is not a string (or str) in the formal sense of a data type. You assign a value to a macro by appending the value enclosed in parentheses at the end of a #define directive. You can use the macro symbol where you want the value to occur in the X++ code.
What is variable in data set?
A variable is any characteristics, number, or quantity that can be measured or counted. A variable may also be called a data item. Age, sex, business income and expenses, country of birth, capital expenditure, class grades, eye colour and vehicle type are examples of variables.
WHAT IS set statement in SAS?
The function of the SET statement is to process existing SAS data sets as input for a DATA step. With no options specified, the SAS System sequentially reads each observation in the named data sets, one observation at a time, until there are no further observations to process.
How do I select a value in SAS?
In SAS, you can select variables from a dataset with the KEEP=-option and the DROP=-option. The KEEP=-option specifies which variables to select, while the DROP=-option indicates which variable to ignore. You can use the KEEP and DROP option in a DATA statement and a SET statement.
How do you define a macro in SAS?
Macro Programs Macro is a group of SAS statements that is referred by a name and to use it in program anywhere, using that name. It starts with a %MACRO statement and ends with %MEND statement.
What is %local in SAS?
The %LOCAL statement creates one or more local macro variables. A macro variable created with %LOCAL has a null value until you assign it some other value. Local macro variables are variables that are available only during the execution of the macro in which they are defined.
What are macro variables in SAS?
A macro variable in SAS is a string variable that allows you to dynamically modify the text in a SAS program through symbolic substitution. The following example demonstrates how to create and use a macro variable. First we set up some system options to have a more concise output style.
How to create variable in SAS?
– FORMAT= – INFORMAT= – LABEL= – LENGTH=.
How to create and use SAS macro functions?
data warehouse. SAS/MACRO can then be used to encapsulate these programs (or processes) and by substituting macro variables into key parts of the program (such as a dataset name) and setting the macro call signature to accept parameters, the program can be made more generic. This enables the programmer to change the function of the program to suit his or her own requirements via the macro call. In creating our functions we will use this advantage to allow the user
What are the automatic variables in SAS?
Automatic variables in SAS are created automatically by the DATA step or by DATA step statements. These variables are added to the program data vector however are usually not output to the data set is created. The values of automatic variables are retained from one iteration of the DATA step to the subsequent, rather than setting it to a
How to use SAS macro to sampling multiple datasets?
Macro triggers are not evaluated inside of single quotes. Also dataset names do not have quotes in them.