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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

Summary

In this chapter, we looked at why ensemble works in the context of classification problems. A series of detailed programs illustrated the point that each classifier must be better than a random guess. We considered scenarios where all the classifiers have the same accuracy, different accuracy, and finally a scenario with completely arbitrary accuracies. Majority and weighted voting was illustrated within the context of the random forest and bagging methods. For the regression problem, we used a different choice of base learners and allowed them to be heterogeneous. Simple and weighted averaging methods were illustrated in relation to the housing sales price data. A simple illustration of stacked regression ultimately concluded the technical section of this chapter.

In the following chapter, we will look at ensembling diagnostics.

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