By group arguments are supported for these functions: ColMean(), ColStdDev(), ColNumber(), ColNMissing(), ColMinimum(), ColMaximum().
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dt << New Column( "Mean of height by sex", Numeric, Formula( Col Mean( :height, :sex ) ) );
 
dt << New Column( "Minimum of height by sex and age",
	Numeric,
	Formula( Col Minimum( :height, :sex, :age ) )
);
 
dt << Distribution( Continuous Distribution( Column( :height ) ), By( :sex ) );
 
dt << Tabulate(
	Show Control Panel( 0 ),
	Add Table(
		Column Table(
			Analysis Columns( :height ),
			Statistics( Mean, N, Std Dev, Min, Max, N Missing )
		),
		Row Table( Grouping Columns( :age, :sex ) )
	)
);

Help created on 9/19/2017