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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

Bootstrap and testing hypotheses

We begin the bootstrap hypothesis testing problems with the t-test to compare means and the F-test to compare variances. It is understood that, since we are assuming normal distribution for the two populations under comparison, the distributional properties of the test statistics are well known. To carry out the nonparametric bootstrap for the t-statistic based on the t-test, we first define the function, and then run the bootstrap function boot on the Galton dataset. The Galton dataset is available in the galton data.frame from the RSADBE package. The galton dataset consists of 928 pairs of observations, with the pair consisting of the height of the parent and the height of their child. First, we define the t2 function, load the Galton dataset, and run the boot function as the following unfolds:

> t2 <- function(data,i) {
+   p <- t.test(data[i,1],data[i,2],var.equal=TRUE)$statistic
+   p
+ }
> data(galton)
> gt <- boot(galton,t2,R=100...

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