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.
How do you set a macro variable in SAS?
Create a Macro Variable with the %LET Statement. The easiest way to create a macro variable in SAS is by using the %LET Macro Statement. This statement creates a macro variable and assigns it a value. You can also use the %LET statement to overwrite the existing value of a macro variable.
Where are macro variables stored in SAS?
symbol tables
Macro variables are stored in symbol tables, which list the macro variable name and its value. There is a global symbol table, which stores all global macro variables. Local macro variables are stored in a local symbol table that is created at the beginning of the execution of a macro.
How do I add a variable to an existing dataset in SAS?
In order to create a new variable in an existing SAS data set, the data set must first be read into SAS and then a data step must be used to create a new SAS data set and the new variable.
How do I use a macro variable as a string?
To reference a macro variable in a literal string, use the SAS macro function %TSLIT. %TSLIT overrides the need for double quotation marks around the literal string and puts single quotation marks around the input value.
How do I use macros in SAS?
Macro variables are referenced by using ampersand (&) followed by macro variable name. We can also declare multiple macro variables and use them at different places in SAS Code. Macro variable are not resolved when they are accessed within single quotes. Hence, we should use double quotes to reference them.
How do you define a macro variable?
Macro Variables. 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.
What is nested macro?
A nested macro instruction definition is a macro instruction definition you can specify as a set of model statements in the body of an enclosing macro definition. This lets you create a macro definition by expanding the outer macro that contains the nested definition.
How do SAS macros work?
SAS Macros are useful when we want to execute same set of SAS statements again and again. This is an ideal case for use of macro rather than typing / copy pasting same statements. Macro is a group of SAS statements that is identified by a name and to use it in program anywhere, we can reference it with that name.
How do you add a new variable to a dataset?
You can use the set command in a data statement to copy an existing dataset and create new variables. The variables can be completely new in which you assign values to them or can be based off existing variables in your dataset and you can manipulate them using mathematical functions.
How do you call a macro in a string in SAS?
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
How do I change the Order of variables in SAS?
Open the SQL procedure with the PROC SQL statement.
What is put in SAS?
the trailing@in the first PUT statement holds the current output line after the value of NAME is written