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      New constraints on oscillation parameters from \({\nu }_{e}\) appearance and \({\nu }_{\mu }\) disappearance in the NOvA experiment

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      Physical Review D
      American Physical Society (APS)

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          A Unified Approach to the Classical Statistical Analysis of Small Signals

          We give a classical confidence belt construction which unifies the treatment of upper confidence limits for null results and two-sided confidence intervals for non-null results. The unified treatment solves a problem (apparently not previously recognized) that the choice of upper limit or two-sided intervals leads to intervals which are not confidence intervals if the choice is based on the data. We apply the construction to two related problems which have recently been a battle-ground between classical and Bayesian statistics: Poisson processes with background, and Gaussian errors with a bounded physical region. In contrast with the usual classical construction for upper limits, our construction avoids unphysical confidence intervals. In contrast with some popular Bayesian intervals, our intervals eliminate conservatism (frequentist coverage greater than the stated confidence) in the Gaussian case and reduce it to a level dictated by discreteness in the Poisson case. We generalize the method in order to apply it to analysis of experiments searching for neutrino oscillations. We show that this technique both gives correct coverage and is powerful, while other classical techniques that have been used by neutrino oscillation search experiments fail one or both of these criteria.
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            A new approach to variable metric algorithms

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              Conditioning of quasi-Newton methods for function minimization

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                Author and article information

                Journal
                PRVDAQ
                Physical Review D
                Phys. Rev. D
                American Physical Society (APS)
                2470-0010
                2470-0029
                August 2018
                August 24 2018
                : 98
                : 3
                Article
                10.1103/PhysRevD.98.032012
                5bb8cf42-d0e2-49ef-a868-b1a519410b68
                © 2018

                https://creativecommons.org/licenses/by/4.0/

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