You can do this, but you have to preprocess the statistics. See the simple script below for an example
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA\big class.jmp" );
dtmax = dt << Summary( Group( :sex, :age ), Max( :height ), Freq( "None" ), Weight( "None" ) );
New Window( "graphs",
H List Box(
dt << Graph Builder(
Size( 570, 520 ),
Variables( X( :SEX ), Y( :Age ), Color( :height ) ),
Elements( Heatmap( X, Y, Legend( 4 ) ) )
),
dtmax << Graph Builder(
Size( 570, 520 ),
Variables( X( :SEX ), Y( :Age ), Color( :name( "max(height)" ) ) ),
Elements( Heatmap( X, Y, Legend( 4 ) ) )
)
)
);
Jim