@emeritus ,
You can use the hide and select approach. Here try this:
dt = Open( "$SAMPLE_DATA/Big Class.jmp" ); // Open a sample data table
// Defining the range which you feel are outliers
dt << Select Where (:height < 62);
// Hiding and Excluding them from your analysis (they will remain in the data table, but are not included in your
//analysis
dt << Hide and Exclude;
// Clear your selection
dt << Clear Select;
// Perform a simple bivariate analysis - notice that the values for height < 62 no longer show up in your plot
dt << Bivariate( Y( :weight ), X( :height ), Fit Line );
Best
Uday