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Hands-On Ensemble Learning with R

Hands-On Ensemble Learning with R

By : Tattar
3 (1)
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Hands-On Ensemble Learning with R

Hands-On Ensemble Learning with R

3 (1)
By: Tattar

Overview of this book

Ensemble techniques are used for combining two or more similar or dissimilar machine learning algorithms to create a stronger model. Such a model delivers superior prediction power and can give your datasets a boost in accuracy. Hands-On Ensemble Learning with R begins with the important statistical resampling methods. You will then walk through the central trilogy of ensemble techniques – bagging, random forest, and boosting – then you'll learn how they can be used to provide greater accuracy on large datasets using popular R packages. You will learn how to combine model predictions using different machine learning algorithms to build ensemble models. In addition to this, you will explore how to improve the performance of your ensemble models. By the end of this book, you will have learned how machine learning algorithms can be combined to reduce common problems and build simple efficient ensemble models with the help of real-world examples.
Table of Contents (15 chapters)
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12
12. What's Next?
13
A. Bibliography
14
Index

Bagging and Random Forests

Chapter 3, Bagging, and Chapter 4, Random Forests, demonstrate how to improve the stability and accuracy of the basic decision tree. In this section, we will primarily use the decision tree as base learners and create an ensemble of trees in the same way that we did in Chapter 3, Bagging, and Chapter 4, Random Forests.

The split function is the primary difference between bagging and random forest algorithms for classification and regression trees. Thus, unsurprisingly, we can continue to use the same functions and packages for the regression problem as the counterparts that were used in the classification problem. We will first use the bagging function from the ipred package to set up the bagging algorithm for the housing data:

> housing_bagging <- bagging(formula = HT_Formula,data=ht_imp,nbagg=500,
+                            coob=TRUE,keepX=TRUE)
> housing_bagging$err
[1] 35820

The trees in the bagging object can be saved to a PDF file in the same way...

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