# What is regression tree method?

## What is regression tree method?

Regression trees are a nonparametric regression method that creates a binary tree by recursively splitting the data on the predictor values. The splits are selected so that the two child nodes have smaller variability around their average value than the parent node.

### Can trees be used for regression?

A regression tree is built through a process known as binary recursive partitioning, which is an iterative process that splits the data into partitions or branches, and then continues splitting each partition into smaller groups as the method moves up each branch.

#### What does a regression tree reflect in a leaf?

The generated regression tree is used for calculation of the continuous target values for new examples. From the root node we traverse along the edges according to the new example’s attribute values until we reach a leaf. Each leaf contains a function that predicts the target value of examples falling in the leaf.

**Is Random Forest cart?**

Random Forest creates multiple CART trees based on “bootstrapped” samples of data and then combines the predictions. A bootstrap sample is a random sample conducted with replacement. Random Forest has better predictive power and accuracy than a single CART model (because of random forest exhibit lower variance).

**How do I know if my RapidMiner is accurate?**

The accuracy is calculated by taking the percentage of correct predictions over the total number of examples. Correct prediction means the examples where the value of the prediction attribute is equal to the value of label attribute.

## How do you get the confusion matrix in RapidMiner?

To see the confusion matrix, click on “recall” or “false negative”, where you will learn that the model discovers 90% of the mines, with 4 false negatives (mines that were identified as rocks).

### How to train the decision tree in RapidMiner?

Click on the Run button. This trains the decision tree model and takes you to the Results View, where you can examine it graphically as well as in textual description. The tree shows that whenever the Attribute ‘Outlook’ has the value ‘overcast’, the Attribute ‘Play’ will have the value ‘yes’.

#### Why are some nodes not split in RapidMiner?

Occurs as prepruning runs parallel to the tree generation process. This may prevent splitting at certain nodes, when splitting at that node does not add to the discriminative power of the entire tree. In such a case, alternative nodes are tried for splitting. Goal: RapidMiner Studio comes with a sample dataset called ‘Golf’.

**What should a successful model in RapidMiner do?**

A successful model should of course minimize the residuals, but since there is more than one way of combining the residuals, there is also a variety of performance metrics. For regression problems, RapidMiner Go provides the following metrics: Let’s convert these formulae into useful advice.

**How is a polynomial data set loaded in RapidMiner?**

The ‘Polynomial’ data set is loaded using the Retrieve operator. The Filter Example Range operator is applied on it. The first example parameter of the Filter Example Range parameter is set to 1 and the last example parameter is set to 100. Thus the first 100 examples of the ‘Polynomial’ data set are selected.