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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

Concepts

Machine Learning

Author (1):

Yu-Wei, Chiu (David Chiu)

Table of Contents (21) Chapters

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)

Viewing the summary of survival analysis

Once we have the survfit object, we can see the summary of it to get some insights.

Getting ready

You need to have completed the previous recipe and have the sfit object from cancer dataset.

How to do it...

Perform the following steps to view the summary:

> sfit <- survfit(Surv(time, status)~sex, data=cancer)
> sfit
Output
Call: survfit(formula = Surv(time, status) ~ sex, data = cancer)

n events median 0.95LCL 0.95UCL
sex=1 138 112 270 212 310
sex=2 90 53 426 348 550


> summary(sfit)
The following are a few lines from the output of the summary command:
Call: survfit(formula = s ~ sex, data = cancer)

 sex=1 
 time n.risk n.event survival std.err lower 95% CI upper 95% CI
 11 138 3 0.9783 0.0124 0.9542 1.000
 12 135 1 0.9710 0.0143 0.9434 0.999
 13 134 2 0.9565 0.0174 0.9231 0.991
 15 132 1 0.9493 0.0187 0.9134 0.987
 26 131 1 0.9420 0.0199 0.9038 0.982

How it works...

The surfit function shows details for different genders. If we look at the...

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Authors (1)

Yu-Wei, Chiu (David Chiu)

Yu-Wei, Chiu (David Chiu) is the founder of LargitData (www.LargitData.com), a startup company that mainly focuses on providing big data and machine learning products. He has previously worked for Trend Micro as a software engineer, where he was responsible for building big data platforms for business intelligence and customer relationship management systems. In addition to being a start-up entrepreneur and data scientist, he specializes in using Spark and Hadoop to process big data and apply data mining techniques for data analysis. Yu-Wei is also a professional lecturer and has delivered lectures on big data and machine learning in R and Python, and given tech talks at a variety of conferences. In 2015, Yu-Wei wrote Machine Learning with R Cookbook, Packt Publishing. In 2013, Yu-Wei reviewed Bioinformatics with R Cookbook, Packt Publishing. For more information, please visit his personal website at www.ywchiu.com. **********************************Acknowledgement************************************** I have immense gratitude for my family and friends for supporting and encouraging me to complete this book. I would like to sincerely thank my mother, Ming-Yang Huang (Miranda Huang); my mentor, Man-Kwan Shan; the proofreader of this book, Brendan Fisher; Members of LargitData; Data Science Program (DSP); and other friends who have offered their support.

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