# What is ID3 algorithm in Weka?

## What is ID3 algorithm in Weka?

ID3 algorithm is one method in the decision tree model, where estimating the discrete value of a function from a decision tree produces an if-then rule so that it is easier to understand.

How can I get ID3 in Weka?

To get Id3, you will need to install the simpleEducationalLearningSchemes package. Your screen shot shows the Explorer window, but to install a package, you should go back to the GUI Chooser and select the Package Manager under the Tools menu.

What is ID3 tree?

ID3 algorithm, stands for Iterative Dichotomiser 3, is a classification algorithm that follows a greedy approach of building a decision tree by selecting a best attribute that yields maximum Information Gain (IG) or minimum Entropy (H).

### What is J48 decision tree in weka?

J48 Classifier. It is an algorithm to generate a decision tree that is generated by C4. 5 (an extension of ID3). It is also known as a statistical classifier.

What is decision tree in DWDM?

A decision tree is a structure that includes a root node, branches, and leaf nodes. Each internal node denotes a test on an attribute, each branch denotes the outcome of a test, and each leaf node holds a class label. The topmost node in the tree is the root node.

What is J48 algorithm?

J48 algorithm is one of the best machine learning algorithms to examine the data categorically and continuously. When it is used for instance purpose, it occupies more memory space and depletes the performance and accuracy in classifying medical data.

## What are the advantages of ID3?

Some major benefits of ID3 are: Understandable prediction rules are created from the training data. Builds a short tree in relatively small time. It only needs to test enough attributes until all data is classified.

How does ID3 algorithm work?

1. Iterative Dichotomiser 3 (ID3): This algorithm uses Information Gain to decide which attribute is to be used classify the current subset of the data. For each level of the tree, information gain is calculated for the remaining data recursively.

Is J48 and C4 5 the same?

5 algorithms or can be called as optimized implementation of the C4. 5. The output of J48 is the Decision tree.

### What is pruning in Weka?

Given that Weka is a machine learning suite, it sounds like what they are referring to is this: http://en.wikipedia.org/wiki/Pruning_(decision_trees) In short the pruning of a decision tree seems to be the removal of possible decisions which do not present much benefit.

Which of the decision matrix is used in ID3 algorithm?

We covered the process of the ID3 algorithm in detail and saw how easy it was to create a Decision Tree using this algorithm by using only two metrics viz. Entropy and Information Gain.