Here is an example.
data have;
set sashelp.class;
if _n_ in (5,10,12) then do;
call missing(height,weight);
end;
call missing(age);
run;
proc format;
value fmt
._-.z='missing'
other='nonmiss';
value $fmt
' '='missing'
other='nonmiss';
run;
proc freq data=have;
table _all_/missing;
format _numeric_ fmt. _character_ $fmt.;
run;
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