Running stat only limits when workspace includes systematics NPs

Roofit and RooStats
1

I have workspaces that include systematics NPs, but I want to run a stat only limit.
How can I do this without needing to remake the workspace. I thought this would be as simple as calling SetNuisanceParameters("") on the ModelConfigs, but that doesn’t work (and would remove the gamma parameters anyhow.

2

Hi,

If you want to remove the systematics, you would need to fix them to their nominal values. It its like to use very strong constraints (their sigma going to zero).

Lorenzo

3

What about parameter->setConstant(true)?
https://root.cern.ch/doc/master/classRooAbsRealLValue.html#ada206bf5e97d88491e89032c1bd7789c

I think that the fitter should now ignore it.
I don’t know, though, if some RooStats tool can re-enable it.

4

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