The probability of fee (c_1) Entropy values which are used to measure the different kinds of data. If the data is a little difference in Entropy values are low, but if the data are very different. the Entropy is high, so if the information Entropy of the node daluk (child) can differentiate good information to have a low Entropy and will make up the IG is when the top node (parent) in the process of creating a model of Decision Tree will calculate the value of each attribute IG versus steel for class attributes that contain most of the IG is a root of a Decision Tree.
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