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JMP Script question: How to use variables to control "show group means"?

Hi all:
I have a question about Variability chart.

I am trying to use a variable "aaa" to control if the a certain variability chart need group means.
Below is the simplified code:
According to the log file, it seems that jmp does not substitute aaa to 0 so that it still plot group means even if
aaa=0.
Is there any way to let jmp to realize aaa is a variable?
Note: The values of aaa could be 0, 1 or "Split1"
Thanks


Code:
aaa=0;

Variability Chart(
Y( :Name( "DIMPLE LG (NM)" ) ),
X( :LOT, :DIMPLE LG ),
Show Group Means ( aaa )
);

Automation and ScriptingBasic Data Analysis and ModelingData Exploration and VisualizationRe: JMP Script question: How to use variables to control "show group means"?

Eval(EvalExpr()) usually works in situations like this

Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Variability Data/2 Factors Crossed.jmp");

show_means = 0;

Eval(EvalExpr(
 varchart = dt << Variability Chart(
  Y(:Measurement), 
  X(:Operator, :part#),
  Show Group Means(Expr(show_means))
 ); 
));