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How to refer to a column in Group By() message in Bivariate Platform

I have a Bivariate Platform scripted like this:

Fit Group(
	biv = Bivariate( Y(Eval(Y_parameters)), X(Eval(X_parameters)), Group By (groupByColumn[1]),
			SendToReport(...)
	)
)

where 

Y_Parameters = {"Param1", "Param2"};
X_Parameters = {"Radius"};
groupByColumn = {"Lot ID"};

So, it works ONLY if my groupByColumn is a list of strings, and only if I refer to it as groupByColumn[1]

if I say 

stringGroupByColumn = groupByColumn[1]

and then use 

Group By (stringGroupByColumn)

it won't work.

WHY?

If I say 

groupByColumn = "Lot ID";

and then use it - it also won't work. WHY?

 

Advanced Statistical ModelingAutomation and ScriptingConsumer and Market ResearchData Blending and CleanupRe: How to refer to a column in Group By() message in Bivariate Platform

The reason it does not work is because you are not setting a variable value, but rather you are passing a message to thr Bivariate Platform.  The proper syntax is

Biv << Group By( :lot ID );

See the Scripting Index for examples