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Cited by 947

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On the “degrees of freedom” of the lasso

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Zou, Hui, Hastie, Trevor, Tibshirani, Robert·2007·The Annals of Statistics

Abstract

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—Cp, 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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Metadata

Authors
Zou, H., Hastie, T., & Tibshirani, R.
Venue
The Annals of Statistics
Published
2007-10-01
Volume
35
Issue
5
Pages
2173-2192
ISSN
0090-5364 (ISSN-L)
OpenAlex
W1995691260
Cited by
947
References
3
FWCI
36.64
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: On the “degrees of freedom” of the lasso. https://app.cochat.ai/papers/10.1214/009053607000000127
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Zou, H., Hastie, T., & Tibshirani, R. (2007). On the “degrees of freedom” of the lasso. The Annals of Statistics. https://doi.org/10.1214/009053607000000127

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