Cited by 507Statistical Methods and InferenceMachine Learning and Data ClassificationStatistical Methods and Applications

Random Forests and Adaptive Nearest Neighbors

Lin, Yi, Jeon, Yongho·2006·Journal of the American Statistical Association

Abstract

In this article we study random forests through their connection with a new framework of adaptive nearest-neighbor methods. We introduce a concept of potential nearest neighbors (k-PNNs) and show that random forests can be viewed as adaptively weighted k-PNN methods. Various aspects of random forests can be studied from this perspective. We study the effect of terminal node sizes on the prediction accuracy of random forests. We further show that random forests with adaptive splitting schemes assign weights to k-PNNs in a desirable way: for the estimation at a given target point, these random forests assign voting weights to the k-PNNs of the target point according to the local importance of different input variables. We propose a new simple splitting scheme that achieves desirable adaptivity in a straightforward fashion. This simple scheme can be combined with existing algorithms. The resulting algorithm is computationally faster and gives comparable results. Other possible aspects of random forests, such as using linear combinations in splitting, are also discussed. Simulations and real datasets are used to illustrate the results.

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Crossref · 10.1198/016214505000001230

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23 of 23 references verified0 citation errors · 0 not checkable

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  • Lin and Jeon (2006) highlighted a connection between random forests and a particular class of nearest neighbor predictors.

    “A critical step was subsequently taken by Lin and Jeon (2006), who highlighted an interesting connection between random forests and a particular class of nearest neighbor predictors, further developed by Biau and Devroye (2010).”

    From A random forest guided tour (2016) · cites this paper as Lin and Jeon (2006)

  • Lin and Jeon (2006) proved that if X is uniformly distributed on [0,1]^p, then provided tree growing is independent of Y_1,...,Y_n, the forest estimate satisfies an inequality involving the maximal number of points in terminal cells.

    “This important connection was first pointed out by Lin and Jeon (2006), who proved that if X is uniformly distributed on [0 , 1] p then, provided tree growing is independent of Y 1 , . . . , Y n (such simplified models are sometimes called non-adaptive ), we have”

    From A random forest guided tour (2016) · cites this paper as Lin and Jeon (2006)

  • If exactly one point is left in the leaves and there is no resampling, then no matter what splitting strategy is used, the forest estimate at x is a weighted average of the Y_i whose corresponding X_i are LNN of x.

    “Indeed, if exactly one point is left in the leaves and if there is no resampling, then no matter what splitting strategy is used, the forest estimate at x is a weighted average of the Y i whose corresponding X i are LNN of x .”

    From A random forest guided tour (2016) · cites this paper as Lin and Jeon (2006)

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Authors
Lin, Y., & Jeon, Y.
Affiliations
University of Wisconsin–Madison (US)
ORCID
Lin, Yi
Venue
Journal of the American Statistical Association
Published
2006-06-01
Volume
101
Issue
474
Pages
578-590
ISSN
  • 0162-1459 (ISSN-L)
  • 1537-274X
OpenAlex
W2047081748
Cited by
507
References
24
Citations by year
2026: 17 · 2025: 31 · 2024: 39 · 2023: 45 · 2022: 35 · 2021: 41 · 2020: 45 · 2019: 49 · 2018: 28 · 2017: 20 · 2016: 24 · 2015: 18 · 2014: 28 · 2013: 14 · 2012: 15
FWCI
6.29
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of the American Statistical Association (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Topics
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Inference
  • Physical Sciences › Computer Science › Artificial Intelligence › Machine Learning and Data Classification
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Applications
Keywords
random forest, voting weights, feature importance, operator splitting, ensemble learning

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