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What are _numeric_ and _character_ and what do they do?

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1. _NUMERIC_ specifies all numeric variables that are already defined in the current DATA step.

2. _CHARACTER_ specifies all character variables that are currently defined in the current DATA step.

3. _ALL_ specifies all variables that are currently defined in the current DATA step.

Example : To include all the numeric variables in PROC MEANS.

proc means;

var _numeric_;

run;

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