FREQ and WEIGHT Statements

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[edit] Issues

What is the difference?

Which procedures support which statements?

Where are the inconsistencies?

[edit] Example

Data: 

data demo;
input FW Value;
cards;
1 1
2 3
;

Using FW as the FREQ variable, as in 

proc means data=demo n mean var;
var value;
freq fw;
run;

produces 

         Analysis Variable : Value                  

           N            Mean        Variance
--------------------------------------------
           3       2.3333333       1.3333333
--------------------------------------------

Using FW as the WEIGHT variable, as in 

proc means data=demo n mean var;
var value;
weight fw;
run;

produces 

    Analysis Variable : Value                  

N            Mean        Variance
---------------------------------
2       2.3333333       2.6666667
---------------------------------

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