Vadim Grinshtein

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We consider rst the spline smoothing nonparametric estimation with variable smoothing parameter and arbitrary design density function and show that the corresponding equivalent kernel can be approximated by the Green's function of a certain linear diierential operator. Furthermore, we propose to use the standard (in applied mathematics and engineering)(More)
We consider a problem of recovering a high-dimensional vector µ observed in white noise, where the unknown vector µ is assumed to be sparse. The objective of the paper is to develop a Bayesian formalism which gives rise to a family of l 0-type penalties. The penalties are associated with various choices of the prior distributions π n (·) on the number of(More)
SUMMARY We consider the problem of estimating the unknown response function in the Gaussian white noise model. We first utilize the recently developed Bayesian maximum a posteriori testimation procedure of Abramovich et al. (2007) for recovering an unknown high-dimensional Gaussian mean vector. The existing results for its upper error bounds over various(More)
SUMMARY We consider estimating a sparse group of sparse normal mean vectors, based on penalized likelihood estimation with complexity penalties on the number of nonzero mean vectors and the numbers of their significant components, which can be performed by a fast algorithm. The resulting estimators are developed within a Bayesian framework and can be viewed(More)
We studied homeostasis, immunity and rheological blood properties in the acute period of ischemic stroke. As intravascular blood coagulation and depression of fibrinolysis happen the amount of "rough" red blood cells increased as well as their aggregates enlarged in size. These changes haven't been seen in patients with lacunar stroke and transient ischemic(More)
We consider model selection in generalized linear models (GLM) for high-dimensional data and propose a wide class of model selection criteria based on penalized maximum likelihood with a complexity penalty on the model size. We derive a general nonasymptotic upper bound for the Kullback-Leibler risk of the resulting estimators and establish the(More)
We studied lipid and carbohydrate metabolism, markers of oxidative stress (plasma malonic dialdehyde and dienoic conjugates) and vascular wall damage (CRP microalbuminuria, blood desquamated endotheliocytes) before and after 12 week treatment of obese pre-diabetic patients. The study showed positive dynamics of the above metabolic parameters with(More)
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