Standard errors and confidence intervals for variable importance in random forest regression, classification, and survival.
Standard errors and confidence intervals for variable importance in random forest regression, classification, and survival.
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DOI:
10.1002/sim.7803
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发表时间:
2019-02-20
影响因子:
2
通讯作者:
Lu M
中科院分区:
文献类型:
--
作者:
Ishwaran H;Lu M
Random forests is a popular nonparametric tree ensemble procedure with broad applications to data analysis. While RF’s widespread popularity stems from its prediction performance, an equally important feature is that it provides a fully nonparametric measure of variable importance (VIMP). A current limitation of VIMP however is that no systematic method exists for estimating its variance. As a solution, we propose a subsampling approach that can be used to estimate the variance of VIMP and for constructing confidence intervals. The method is general enough that it can be applied to many useful settings, including regression, classification, and survival problems. Using extensive simulations we demonstrate the effectiveness of the subsampling estimator and in particular find that the delete-d jackknife variance estimator, a close cousin, is especially effective under low subsampling rates due to its bias correction properties. These two estimators are highly competitive when compared to the .164 bootstrap estimator, a modified bootstrap procedure designed to deal with ties in out-of-sample data. Most importantly, subsampling is computationally fast, thus making it especially attractive for big data settings.
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影响因子:
2.2
作者:
Gregorutti, Baptiste;Michel, Bertrand;Saint-Pierre, Philippe
通讯作者:
Saint-Pierre, Philippe
影响因子:
3.7
作者:
HOEFFDING, W
通讯作者:
HOEFFDING, W
DOI:
10.1198/106186006x133933
发表时间:
2006-09-01
影响因子:
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通讯作者:
Tuleau-Malot, Christine