FIT Spline in Loop Function

[#1]

I am using below loop function to create Bivariate charts by Column " MEASUREMENT_FLAG_NOCHAMBER". However , I want to add more FIT Spline grouping by " WLT_COMPONENT" but fail again and again. anybody can help check what I can do for below script ?

dt = Current Data Table();

Summarize( dt, byVals = by( :MEASUREMENT_FLAG_NOCHAMBER ) );

Bi = Bivariate( X( :LOT_DATA_COLLECT_DATE ), Y( :CHART_VALUE ), by( :MEASUREMENT_FLAG_NOCHAMBER ));

For( i = 1, i <= N Items( byVals ), i++,

LCL = :LO_CONTROL_LMT[(dt << get rows where( :MEASUREMENT_FLAG_NOCHAMBER == byVals[i] ))[1]];
UCL = :UP_CONTROL_LMT[(dt << get rows where( :MEASUREMENT_FLAG_NOCHAMBER == byVals[i] ))[1]];
TGT = :TARGET[(dt << get rows where( :MEASUREMENT_FLAG_NOCHAMBER == byVals[i] ))[1]];

chartMin = Min( :CHART_VALUE[dt << get rows where( :MEASUREMENT_FLAG_NOCHAMBER == byVals[i])]);
chartMax = Max( :CHART_VALUE[dt << get rows where( :MEASUREMENT_FLAG_NOCHAMBER == byVals[i])]);

If(LCL < chartMin, chartMin = LCL );
If(UCL > chartMax, chartMax = UCL );

chartRange5% = (chartMax - ChartMin)/5;
Gridset=(UCL - LCL)/5;

chartMin = chartMin - chartRange5%;
chartMax = chartMax + chartRange5%;

Eval(
Substitute(
Expr(
Bi << SendToByGroup(
{:MEASUREMENT_FLAG_NOCHAMBER == __byVals__},
SendToReport(
Dispatch(
{},
"1",
ScaleBox,
{Format( "y/m/d h:m:s", 22, 0 ), Min(),
Max( ), Interval( "Day" ), Inc( 1 ), Minor Ticks( 0 ),
Label Row( Label Orientation( "Vertical" ) )}
),
Dispatch(
{},
"2",
ScaleBox,
{Min( __min__ ), Max( __max__ ), Inc( __Grid__ ), Minor Ticks( 1 ), Label Row( Show Major Grid( 1 )),
Add Ref Line( __LCL__, "Solid", "Medium Dark Red", "LCL", 1 ),
Add Ref Line( __TAR__, "Solid", "Blue", "Target", 2 ),
Add Ref Line( __UCL__, "Solid", "Medium Dark Red", "UCL", 1 )}
),
Dispatch(
{},
"Bivar Plot",
FrameBox,
{Frame Size( 850, 750 ),Row Legend(
WLT_COMPONENT,
Color( 1 ),
Color Theme( "JMP Default" ),
Marker( 1 ),
Marker Theme( "Standard" ),
Continuous Scale( 0 ),
Reverse Scale( 0 ),
Excluded Rows( 0 )
)}
)
)
)
),
Expr( __byVals__ ), byVals[i],
Expr( __UCL__ ), UCL,
Expr( __LCL__ ), LCL,
Expr( __min__ ), chartMin,
Expr( __max__ ), chartMax,
Expr( __Grid__ ), Gridset,
Expr( __TAR__ ), TGT
),
);
);

[#2]

maybe try making the graph manually the first time, like you are in the fitY by X platform.

Then from the red triangle menu, choose, "Group By" and select WLT_component.  

Save the script to the script window so you can get the JSL for adding the grouping variable top add to your script.