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Estimation theory
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minimax optimality The objective of the present paper is to develop a minimax theory for the varying coefficient model in a non-asymptotic setting. We consider a high-dimensional sparse varying coefficient model where only few of the covariates are present and only some of those covariates are time dependent. Our analysis allows the time dependent covariates to have different degrees of smoothness and to be spatially inhomogeneous. We develop the minimax lower bounds for the quadratic risk and construct an adaptive estimator which attains those lower bounds within a constant (if all time-dependent covariates are spatially homogeneous) or logarithmic factor of the number of observations
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Sparse high-dimensional varying coefficient model : non-asymptotic minimax study
Klopp, Olga
;
Pensky, Marianna
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2013
Persistent link: https://www.econbiz.de/10010342692
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