Assessing the similarity of 2-Dimensional histograms

ROOT
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I wish to assess the similarity of two 2-dimensional histograms (i.e. two TH2’s). By similarity, I mean in the same sense as applying the Chi-Sqared test to two 1-dimensional histograms. Typically, I’d use TH1:Chi2Test for TH1’s. What can be used for TH2’s?

I can’t seem to find anything in the TH2 documentation.

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2

Hi,

You can use TH1::Chi2Test also for TH2. Since TH2 derives from TH1 the function is available.
However, functions like TH1::KolmogorovTest and TH1::AndersonDarlingTest will work only for 1d histograms and will report an error if used for a TH2

Lorenzo

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