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A fast splitting procedure for classification trees 总被引:1,自引:0,他引:1
This paper provides a faster method to find the best split at each node when using the CART methodology. The predictability index is proposed as a splitting rule for growing the same classification tree as CART does when using the Gini index of heterogeneity as an impurity measure. A theorem is introduced to show a new property of the index : the for a given predictor has a value not lower than the for any split generated by the predictor. This property is used to make a substantial saving in the time required to generate a classification tree. Three simulation studies are presented in order to show the computational gain in terms of both the number of splits analysed at each node and the CPU time. The proposed splitting algorithm can prove computational efficiency in real data sets as shown in an example. 相似文献
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神经科学家已经能够用特别的仪器,把人脑的活动测绘记录下来.这种革新技术让我们能一窥人的思想,而其中每种技术也都各有长处. 相似文献
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BUSH DIANE E.; SIMMONS ROBERTA G.; HUTCHINSON BRUCE; BLYTH DALE A. 《Public opinion quarterly》1977,41(4):459-474
Findings from a study of 798 sixth- and seventh-grade studentsin Milwaukee in 1974–75 were compared to those from astudy of 470 Baltimore sixth- and seventh-grade children in1968 to see if the new feminist ideology has had an effect ongirls' self-esteem and attitudes toward their own sex. Resultsindicate few differences between the two studies. Girls in 1974–75still demonstrated lower self-esteem and a less high evaluationof their sex-role than did their male counterparts 相似文献
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