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List: wekalist
Subject: [Wekalist] About average impurity decrease from RandomForest
From: lgarciaag89 <lgarciaag89 () gmail ! com>
Date: 2021-04-15 0:13:14
Message-ID: 1618445594629-0.post () n7 ! nabble ! com
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Hi
I have a doubt respect the values of impurity decrease from RandomForest,
respect to a regression problem weka use a function based on varience for
compute the impurity decrease values. for example for the next command:
/*java weka.classifiers.trees.RandomForest -t data/iris.arff
-attribute-importance*/
a output part has this form:
/*Attribute importance based on average impurity decrease (and number of
nodes using that attribute)
0.63 ( 238) petallength
0.55 ( 67) sepalwidth
0.55 ( 133) sepallength
0.53 ( 168) petalwidth*/
if i want compare the attributes using the average impurity decrease, ¿Do I
have to minimize or maximize with respect to average impurity decrease?
¿where are reported the function based on variance for compute the impurity
decrease?
¿How i can get number of nodes using that attribute values?
best regards,
Luis
--
Sent from: https://weka.8497.n7.nabble.com/
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