Help needed with Correl Syntax/Set Analysis with Variable

[datagrrl]

=Correl(Aggr(Sum({<Color = {'Orange'},[YFlag] = {1}>} Value),MeasureDate),Aggr(Sum({<Color = {'Blue'},[YFlag] = {1}>} Value),MeasureDate))

So the above expression works perfectly

I now want to open it up for my users to pick "Colors" to compare

I know the Variables are throwing the correct values, because every other object that depends on them is working.

The expression checker says syntax for the following is ok:

=Correl(Aggr(Sum({<Color = {$(vColor2)},[YFlag] = {1}>} Value),MeasureDate),Aggr(Sum({<Color = {$(vColor1)},[YFlag] = {1}>} Value),MeasureDate))

But I get a Null Value.

I am thinking I might have to change this back to a Sum if, but having to include two dimensions it made more sense to use set analysis.

Let me know if you have any suggestions.

Thanks again.

[datagrrl · Accepted solution]

So I figured this out.

=Correl(Aggr(Sum({<Color = {"$(vColor2)"},[YFlag] = {1}>} Value),MeasureDate),Aggr(Sum({<Color = {"$(vColor1)"},[YFlag] = {1}>} Value),MeasureDate))

I really did try putting quotes in earlier, but they didn't work. I think I may have been putting them on the wrong side of the $.