How does predict work for classification tree algorithm?

Question

Hadas Lapid 2013년 11월 14일

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https://kr.mathworks.com/matlabcentral/answers/106142-how-does-predict-work-for-classification-tree-algorithm

답변: Hadas Lapid 2013년 11월 17일

Following classification with ClassificationTree.fit I get an object obj which contains all model parameters. Then when using predict(data,model) I try it on new data. Question is that I need to translate the predict code into human language, in order to transform it into c code. The code does Not support predict. Can anyone direct me to the full algorithm predict performs? (I couldn't figure it out from predict.m directly..) Many many thanks Hadas

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Answer 1

Shashank Prasanna 2013년 11월 14일

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https://kr.mathworks.com/matlabcentral/answers/106142-how-does-predict-work-for-classification-tree-algorithm#answer_115243

편집: Shashank Prasanna 2013년 11월 14일

Type:

>> view(obj)

you can visualize the tree.

predict generates predictions by following the branches of tree until it reaches a leaf node or a missing value. If predict reaches a leaf node, it returns the classification of that node.

This information is also available in the documentation, scroll down to Algorithm section:

http://www.mathworks.com/help/stats/compactclassificationtree.predict.html

Also here is some theory that you may find useful:

http://www.mathworks.com/help/stats/classification-trees-and-regression-trees.html#bsw6a62