Table of Contents

• What is CMS Combine tool?
• Some references
• FAQ

What is CMS Combine tool?

RooStats/RooFit - based software tools used for statistical analysis within the CMS. This provides a command line interface to many different statistical techniques available inside RooFit/RooStat.

Some references

1. Github page of CMS combine document: link
2. Combine Tutorial: Fit Diagnostics: link
3. Debugging failing fits: link
4. Higgs combine tutorial links: link

FAQ

1. Conventions to be used when preparing inputs for Higgs combinations: link

2. How we can fit and float the rate for a particular process:

For this in combine there is an option of “rateParam”. We can check more details here: link1 and link2

1. To freeze we can use the following syntax:

   Yield_qqZZ rateParam a2_recobin0 bkg_qqzz  1
   nuisance edit  freeze Yield_qqZZ