We attempt to recover an n-dimensional vector observed in white noise, where n is large and the vector is known to be sparse, but the degree of sparsity is unknown. We consider three different ways of ...

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Most mathematical models do not admit exact solutions. Asymptotic and perturbation methods provide powerful techniques for obtaining approximate solutions, which allow one to draw physical conclusions ...

This is a preview. Log in through your library . Abstract Response-adaptive designs in clinical trials involve incorporating accruing information from patient responses to treatment into the ...