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Wasserstein posterior contraction rates in non-dominated Bayesian nonparametric models

Posterior contractions rates (PCRs) strengthen the notion of Bayesian consistency, quantifying the speed at which the posterior distribution concentrates on arbitrarily small neighborhoods of the “true model”, with probability tending to 1 or almost surely, as the sample size goes to infinity. In this paper, we study PCRs in non-dominated Bayesian nonparametric models for the observations, thus assuming that posterior distributions are available through a more general disintegration argument ...

On the power of private likelihood-ratio tests for goodness-of-fit in frequency tables

Privacy-protecting data analysis is a rising challenge in modern statistics, as the achievement of data confidentiality guarantees, which typically occur through a perturbation of the data, may determine a loss in the “statistical” utility of the data. In this paper, we consider the likelihood-ratio (LR) test for private goodness-of-fit in frequency tables, and study its large sample properties. Under the global (ε, δ)-differential privacy (DP) for frequency tables, with ε,δ ≥ 0 being param...

Laws of large numbers and central limit theorem for Ewens-Pitman model

The Ewens-Pitman model is a distribution on random partitions of {1, …, n}, with n ∈ N, indexed by α ∈ [0, 1) and θ > −α, where α = 0 corresponds to the Ewens model in population genetics. The large n asymptotic behaviour of the number K_n of blocks in the Ewens-Pitman random partition has been extensively studied, showing that K_n scales as log n for α=0 and as n^α for α ∈ (0,1), yielding a non-random limit and random limit, respectively. In this paper, we study the large n asymptotic ...

Search for single production of vector-like quarks decaying into W(ℓν)b in pp collisions at $$ \sqrt{s}=13 $$ TeV with the ATLAS detector

A search for single production of a vector-like quark Q, which could be either a singlet T, with charge 23, or a Y from a (T, B, Y) triplet, with charge −43, is performed using data from proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to the full integrated luminosity of 140 fb−1 recorded with the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis targets Q → Wb decays where the W boson decays leptonically. The data are found to be consis...

A continuous calibration of the ATLAS flavour-tagging classifiers via optimal transportation maps

A calibration of the ATLAS flavour-tagging algorithms using a new calibration procedure based on optimal transportation maps is presented. Simultaneous, continuous corrections to the b-jet, c-jet, and light-flavour jet classification probabilities from jet-tagging algorithms in simulation are derived for b-jets using tt¯→eμννbb data. After application of the derived calibration maps, closure between simulation and observation is achieved for jet flavour observables used in ATLAS analyses of L...

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Prodotti recenti

Wasserstein posterior contraction rates in non-dominated Bayesian nonparametric models

On the power of private likelihood-ratio tests for goodness-of-fit in frequency tables

Laws of large numbers and central limit theorem for Ewens-Pitman model

Search for single production of vector-like quarks decaying into W(ℓν)b in pp collisions at $$ \sqrt{s}=13 $$ TeV with the ATLAS detector

A continuous calibration of the ATLAS flavour-tagging classifiers via optimal transportation maps

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