Book Image

Statistical Application Development with R and Python - Second Edition

Book Image

Statistical Application Development with R and Python - Second Edition

Overview of this book

Statistical Analysis involves collecting and examining data to describe the nature of data that needs to be analyzed. It helps you explore the relation of data and build models to make better decisions. This book explores statistical concepts along with R and Python, which are well integrated from the word go. Almost every concept has an R code going with it which exemplifies the strength of R and applications. The R code and programs have been further strengthened with equivalent Python programs. Thus, you will first understand the data characteristics, descriptive statistics and the exploratory attitude, which will give you firm footing of data analysis. Statistical inference will complete the technical footing of statistical methods. Regression, linear, logistic modeling, and CART, builds the essential toolkit. This will help you complete complex problems in the real world. You will begin with a brief understanding of the nature of data and end with modern and advanced statistical models like CART. Every step is taken with DATA and R code, and further enhanced by Python. The data analysis journey begins with exploratory analysis, which is more than simple, descriptive, data summaries. You will then apply linear regression modeling, and end with logistic regression, CART, and spatial statistics. By the end of this book you will be able to apply your statistical learning in major domains at work or in your projects.
Table of Contents (19 chapters)
Statistical Application Development with R and Python - Second Edition
Credits
About the Author
Acknowledgment
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Index

Summary


We began with the idea of recursive partitioning and gave a legitimate reason why such an approach is practical. The CART technique is completely demystified by using the getNode function, which has been defined appropriately, depending upon whether we require a regression or a classification tree. With the conviction behind us, we applied the rpart function to the German credit data, and with its results, we basically had two problems.

First, the fitted classification tree appeared to overfit the data. This problem can often be overcome by using the minsplit and cp options. The second problem was that the performance was really poor in the validate region. Though the reduced classification trees had slightly better performance as compared to the initial tree, we still need to improve the classification tree.

The next chapter will focus more on this aspect and discuss the modern development of CART. The user can now develop decision trees using either of the two software programs.