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Discussion to Least Angle Regression AbstractIn this paper we discuss the Least Angle Regression algorithm proposed by Efron et al. for variable selection. In particular, in the orthogonal case we interprete their Mallows type criterion to select the number of influential variables as a penalized hard thresholding procedure. In the spirit of Birge and Massart (2004), this interpretation may lead to a data-driven strategy for penalization without knowing in advance the level of noise. Bien cordialement, Pascal Massart
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