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Machine Learning with R Cookbook, Second Edition - Second Edition

You're reading from  Machine Learning with R Cookbook, Second Edition - Second Edition

Product type Book
Published in Oct 2017
Publisher Packt
ISBN-13 9781787284395
Pages 572 pages
Edition 2nd Edition
Languages
Author (1):
Yu-Wei, Chiu (David Chiu) Yu-Wei, Chiu (David Chiu)
Profile icon Yu-Wei, Chiu (David Chiu)
Toc

Table of Contents (21) Chapters close

Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
1. Practical Machine Learning with R 2. Data Exploration with Air Quality Datasets 3. Analyzing Time Series Data 4. R and Statistics 5. Understanding Regression Analysis 6. Survival Analysis 7. Classification 1 - Tree, Lazy, and Probabilistic 8. Classification 2 - Neural Network and SVM 9. Model Evaluation 10. Ensemble Learning 11. Clustering 12. Association Analysis and Sequence Mining 13. Dimension Reduction 14. Big Data Analysis (R and Hadoop)

Performing a two-way ANOVA


A two-way ANOVA can be viewed as the extension of a one-way ANOVA, for the analysis covers more than two categorical variables rather than one. In this recipe, we will discuss how to conduct a two-way ANOVA in R.

Getting ready

Ensure that mtcars has already been loaded into a DataFrame within an R session. Since the twoway.test, TukeyHSD, and interaction.plot functions are originated from the stats package, make sure the library, stats, is loaded.

How to do it...

Perform the following steps:

  1. First we plot the two boxplots of factor gears regarding mpg, with the plot separated from the transmission type:
        > par(mfrow=c(1,2))
        > boxplot 
         (mtcars$mpg~mtcars$gear,subset=(mtcars$am==0),xlab='gear'
         , ylab = "mpg",main='automatic') 
        > boxplot
         (mtcars$mpg~mtcars$gear,subset=(mtcars$am==1),xlab='gear',
         ylab = "mpg", main='manual')

The boxplots of mpg by the gear group and the transmission type

  1. Also, you may produce...
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