proc means

/*
PROC MEANS ;
        BY variable-1 <... variable-n>; 
     CLASS variable(s)
           ; 
      FREQ variable; 
        ID variable(s); 
    OUTPUT
          
          
          
          
           ; 
     TYPES request(s); 
       VAR variable(s)
           < / WEIGHT=weight-variable>; 
      WAYS list; 
    WEIGHT variable; 

BY     : Calculate separate statistics for each BY group
CLASS  : Identify variables whose values define subgroups for the analysis
FREQ   : Identify a variable whose values represent the frequency of each observation
ID     : Include additional identification variables in the output data set
OUTPUT : Create an output data set that contains specified statistics and identification variables
TYPES  : Identify specific combinations of class variables to use to subdivide the data
VAR    : Identify the analysis variables and their order in the results
WAYS   : Specify the number of ways to make unique combinations of class variables
WEIGHT : Identify a variable whose values weight each observation in the statistical calculations

--> 최대값(max), 최소값(min), 평균값(mean), 표준값(std) 출력함..
*/
proc sort data=sashelp.prdsal2 out=test;
       by country state;
run;

proc means data=test;
        by country state;
     class year month;
    output out = aaa;
       var actual predict;
quit;


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