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arxiv physics/0207083 v2 pith:7REEDSBN submitted 2002-07-22 physics.data-an physics.gen-ph

A Measure of the Goodness of Fit in Unbinned Likelihood Fits

classification physics.data-an physics.gen-ph
keywords datafittedgoodnesslikelihoodmeasureunbinnedfitsbinned
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Maximum likelihood fits to data can be done using binned data (histograms) and unbinned data. With binned data, one gets not only the fitted parameters but also a measure of the goodness of fit. With unbinned data, currently, the fitted parameters are obtained but no measure of goodness of fit is available. This remains, to date, an unsolved problem in statistics. Using Bayes theorem and likelihood ratios, we provide a method by which both the fitted quantities and a measure of the goodness of fit are obtained for unbinned likelihood fits, as well as errors in the fitted quantities. We provide an ansatz for determining Bayesian a priori probabilities.

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