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What is 'cat' param used for in TreeBagger method

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dennis vella
dennis vella 2013-3-16
I am following the tutorial and am trying to implement TreeBagger Method. I have a question since I cannot understand part of the code.
b = TreeBagger(nTrees,X,Y,'oobpred','on','cat',6,'minleaf',leaf(ii));
can anyone tell me what 'cat' is and the number 6 please?
Thanks

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回答（2 个）

Walter Roberson
Walter Roberson 2013-3-16
TreeBagger also accepts classregtree options.
http://www.mathworks.com/help/stats/classregtree.html
categorical — Vector of indices of the columns of X that are to be treated as unordered categorical variables
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dennis vella
dennis vella 2013-3-16
Does this mean that the number listed near 'cat' is possibly the number of columns that a dataset would have?

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Tom Lane
Tom Lane 2013-3-16
This means that column 6 of X is to be treated as categorical. Suppose it takes values 1,2,3. If X were continuous, splits would be of the form
x<1.5 % separates 1 from {2,3}, or
x<2.5 % separates {1,2} from 3
If X were categorical, then there is no ordering assumed so you could have a split that separates class 2 from classes {1,3}.

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