Fit histogram to another historgam

[Wile_E_Coyote]

I guess, in general (when stretching/shrinking and scaling are needed), you would need to write your own “chi2” or “likelihood” function.
See: ${ROOTSYS}/tutorials/fit/

You could also try to use (but the involved histograms need to have well “aligned” bins, I guess):

• TFractionFitter

• an idea given in:

Newbie Fit/RooFit Question

Hi @katrina09, indeed, RooFit is well suited for this! You can find the necessary code snippets for your task in the RooFit tutorials. In particular, take a look at: ROOT: tutorials/roofit/rf706_histpdf.C File Reference, which tells you how to build a pdf based of template histograms ROOT: tutorials/roofit/rf201_composite.C File Reference, which tells you how to create the normalized sum of two pdfs Note that in ht e tutorial overview, there are also links to the Python version of both tu…