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Machine Learning with R

Machine Learning with R

By : Brett Lantz
4.4 (73)
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Machine Learning with R

Machine Learning with R

4.4 (73)
By: Brett Lantz

Overview of this book

Machine learning, at its core, is concerned with transforming data into actionable knowledge. This fact makes machine learning well-suited to the present-day era of "big data" and "data science". Given the growing prominence of R—a cross-platform, zero-cost statistical programming environment—there has never been a better time to start applying machine learning. Whether you are new to data science or a veteran, machine learning with R offers a powerful set of methods for quickly and easily gaining insight from your data. "Machine Learning with R" is a practical tutorial that uses hands-on examples to step through real-world application of machine learning. Without shying away from the technical details, we will explore Machine Learning with R using clear and practical examples. Well-suited to machine learning beginners or those with experience. Explore R to find the answer to all of your questions. How can we use machine learning to transform data into action? Using practical examples, we will explore how to prepare data for analysis, choose a machine learning method, and measure the success of the process. We will learn how to apply machine learning methods to a variety of common tasks including classification, prediction, forecasting, market basket analysis, and clustering. By applying the most effective machine learning methods to real-world problems, you will gain hands-on experience that will transform the way you think about data. "Machine Learning with R" will provide you with the analytical tools you need to quickly gain insight from complex data.
Table of Contents (19 chapters)
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Machine Learning with R
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
9
Finding Groups of Data – Clustering with k-means
Index

Measuring performance for classification


To measure classification performance in previous chapters, we used a measure of accuracy that divided the proportion of correct predictions by the total number of predictions. This number indicates the percentage of cases in which the learner is right or wrong. For instance, suppose a classifier correctly identified whether or not 99,990 out of 100,000 newborn babies are carriers of a treatable but potentially-fatal genetic defect. This would imply an accuracy of 99.99 percent and an error rate of only 0.01 percent.

Although this would appear to indicate an extremely accurate classifier, it would be wise to collect additional information before trusting your child's life to the test. What if the genetic defect is found in only 10 out of every 100,000 babies? A test that predicts "no defect" regardless of circumstances will still be correct for 99.99 percent of all cases. In this case, even though the predictions are correct for the large majority...

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