On the "degrees of freedom" of the lasso

Details On the "degrees of freedom" of the lasso On the "degrees of freedom" of the lasso

2007-12-06

arxiv.org/abs/0712.0881v1

Annals of Statistics 2007, Vol. 35, No. 5, 2173-2192

Mathematics

Statistics Theory

Published in at http://dx.doi.org/10.1214/009053607000000127 the Annals of Statistics (http://www.imstat.org/aos/) by the Inst

Scientific paper

10.1214/009053607000000127

We study the effective degrees of freedom of the lasso in the framework of Stein's unbiased risk estimation (SURE). We show that the number of nonzero coefficients is an unbiased estimate for the degrees of freedom of the lasso--a conclusion that requires no special assumption on the predictors. In addition, the unbiased estimator is shown to be asymptotically consistent. With these results on hand, various model selection criteria--$C_p$, AIC and BIC--are available, which, along with the LARS algorithm, provide a principled and efficient approach to obtaining the optimal lasso fit with the computational effort of a single ordinary least-squares fit.

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