how do I add labels to a bar chart showing the N for each mean

[#1]

vertical bar chart, where each bar represents the mean(col name)? no problem, done

now we want to show the N for each of those means, right at the top of each column

help? thanks

[#2]

You can do this in JMP 11 with Graph Builder.  Prior to version 11 you could only label bars using the Chart platform.

Here's an example that displays the bar label in JMP 11:

dt = open("$sample_data\Bands Data.jmp");

dt << Graph Builder(

    Show Control Panel( 0 ),

    Variables( X( :ink type ), Y( :viscosity ), Overlay( :cylinder size ) ),

    Elements( Bar( X, Y, Legend( 2 ), Bar Style( "Side by side" ),

            Summary Statistic( "Mean" ), Label( "Value" )

        )

    )

);

In Graph Builder you use the label combobox to select Value:

[#3]

Try using a summary table with both Mean and N, with the latter labelled. Here's an example with Chart platform.

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );

dtsum = dt << Summary( Group( :sex ), Mean( :height ), N( :height ) );

Column( dtsum, 4 ) << label;

dtsum << Chart(

  X( :sex ),

  Y( :Name( "Mean(height)" ) ),

  Label by Row,

  Show Labels,

  Bar Chart( 1 )

);