Apply sPlot weights twice

[mwilkins]

Hello, @StephanH,

@StephanH

Would it be an option to go to a binned distribution?

We would really prefer to stick with unbinned if possible.

@StephanH

Would it be possible to make a combined model that extracts s weights in a single fit? Maybe something like a 2D model?

2D fits pose their own challenges, complicating what should be a simple fit.

@StephanH

With two sets of s weights, you might get into trouble, though, because just multiplying them might be wrong.

Multiplying them is certainly wrong as s-weights can be negative. It is, in my understanding, also incorrect to multiply s-weights with already-applied weights in general, however, because they are already factored into the weights output by SPlot. I am asking the forum primarily because I am not sure whether this is still true in the case of s-weights (I noticed the set of s-weights2 does not sum to 1, for instance) and because I am not 100% sure of my reading of the source code.