Make Combined Data Table - various Group By columns - is there a BUG?

[#1]

Let's run this code:

Names Default To Here(1); 

dt = open("$SAMPLE_DATA/Big Class.jmp");

fg = dt << Fit Group(
	Bivariate(
		Y( :height ),
		X( :weight ),
		Group By(:age),
		Fit Line
	),
	Bivariate(
		Y( :height ),
		X( :weight ),
		Group By(:age),
		Fit Line
	),
	Bivariate(
		Y( :height ),
		X( :weight ),
		Group By(:age),
		Fit Line
	),		
	Bivariate(
		Y( :height ),
		X( :weight ),
		Group By(:sex),
		Fit Line
	),
	<<{Arrange in Rows( 4 )}
);

You'll get a Fit Group where the last Bivariate has a different Group By column (:sex instead of :age)

Then let's click on the first "Summary of Fit" and select Make Combined Data Table.

We'll see that the age column has missing values for the plot that has Group By column NOT :age, and there is no column called "sex"

Age column has missing values where Group By column is not Age

Seems like a bug. At least I did not expect that behavior.

Group By column is also a variable - same as X or Y.

I would expect it to either concatenate tables and have a column for for each Group By variable, or, to make further analysis easier - jsut stack them and output just two columns: Group By Name and Group By Value.

If it's a bug - where would I submit it? 

[#2]

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