Papers › Scaling property of the statistical Two-Sample Energy Test
Scaling property of the statistical Two-Sample Energy Test
G. Zech
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The energy test is a powerful binning-free, multi-dimensional and distribution-free tool that can be applied to compare a measurement to a given prediction (goodness-of-fit) or to check whether two data samples originate from the same population (two-sample test). In both cases the distribution of the test statistic under the null hypothesis H_0, (correct prediction, same population) has to be obtained by simulation. This poses computational problems if the data samples are large, but the difficulty can be overcome with the help of a scaling property which relates the distribution of small samples to the distribution of large samples. Scaling has been made plausible in Ref. W. Barter et al. JINST 13 P04011 by extensive simulations. In this article an analytic proof is presented which makes the calculation of p-values obtained by scaling more reliable.
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