Add dense ranking to Ranking Tie and Col Rank functions
Col N Categories (💚)
new in JMP19 : New in Graph Builder for JMP 19
very helpful : )

Details you should be aware of:
1) excluded rows are not included in the calculation
[ very useful, along the idea of Formula Editor: meaningful results with excluded rows ,
nevertheless: somewhat inconsistent, in view of the behavior of other Col... aggregations!]
Names Default to Here(1);
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dt << Clear Select << Select Rows( Index( 3, 8 ) ) << Exclude;
dt<< New Formula Column(
Operation( Category( "Aggregate" ), "Score Unique" ),
Columns( :name ),
Group By( :sex )
) << Run Formulas;

1b) unfortunately, the results don't get update when row states are changed:
[TS-00231503]
wait(2);
dt<< Clear Select << Select Rows( Index( 3, 8 ) ) << Exclude;
[to trigger an update, change a cell in the input column and change it back]
2) Just work with "columns", don't work with expressions.
this column has missing entries:
New Column( "Score Unique[1st character of name][sex]",
Formula( Col Score( Substr( :name, 1, 1 ), :sex ) ))
[This appears to be somewhat inconsistent, in view of the behavior of other Col... aggregations]
[TS- 00215787]