By group arguments are supported for these JSL functions: ColMean(), ColStdDev(), ColNumber(), ColNMissing(), ColMinimum(), ColMaximum().
Any number of By arguments can be specified, and you can use expressions for the By arguments. By arguments must be used in a column formula, or in the context of ForEachRow(). The first argument can also be a general numeric expression.
Here is an example:
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 ) )
)
);