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On the rate of convergence in non-central asymptotics of the Hermite variations of fractional Brownian sheet

Breton J. -C

Probability and Mathematical Statistics

2011

Vol. 31, Fasc. 2

301--311

The Hermite variations of the anisotropic fractional Brownian sheet enjoy similar behaviour to that for the fractional Brownian motion: central (convergence to a normal distribution) or non-central (convergence to a Hermite-type distribution). In this note, we investigate the rate of convergence in the non-central case.

Curse of dimensionality in approximation of random fields

Lifshits M. A., Tulyakova V.

Probability and Mathematical Statistics

2006

Vol. 26, Fasc. 1

97--112

Consider a random field of tensor product-type X(t), t∈[0,1]d, given by [formula] where (λ(i))i>0∈l2(φi)i>0 is an orthonormal system in L2 [0, 1] and (ξk)k∈Nd are non-correlated random variables with zero mean and unit variance. We investigate the quality of approximation (both in the average and in the probabilistic sense) to X by the n-term partial sums Xn minimizing the quadratic error E‖X‒Xn‖2, In the first part of the paper we consider the case of fixed dimension d. In the second part, following the suggestion of H. Woźniakowski, we consider the same problem for d→∞. We show that, for any fixed level of relative error, approximation complexity increases exponentially and we find the ex- plosion coefficient. We also show that the behavior of the probabilistic and average complexity is essentially the same in the large domain of parameters.