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Explain how %Let and macro parameters can be used to create micro variables in SAS programming? |
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Answer» %LET: %Let is GENERALLY used to create MICRO variables and assign values to them. You can define it inside or OUTSIDE a macro. Syntax: %LET macro-variable-name = value; Any number, text or date can be entered in the Value field, depending on what the program requires. How to use the Micro Variable? Whenever referencing macro variables, an AMPERSAND (&) is used followed by the macro variable name as shown below: & <Macro variable Name> Macro Parameters: Macros have variables called parameters whose values you set when you invoke the macro. The parameters are added to a macro by naming them in parenthesis in %macro. Syntax: %MACRO macro-name (parameter-1= , parameter-2= , ......parameter-n = ); Macro Statements; %MEND;How to call a Macro? To call/use micro variables, we use % followed by the macro variable name and then pass parameters. |
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