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Statistical Application Development with R and Python

Statistical Application Development with R and Python - Second Edition

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Statistical Application Development with R and Python

Statistical Application Development with R and Python

4.3 (4)

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 (12 chapters)
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11
Index

Chapter 10. CART and Beyond

In the previous chapter, we studied CART as a powerful recursive partitioning method, useful for building (nonlinear) models. Despite the overall generality, CART does have certain limitations that necessitate some enhancements. It is these extensions that form the crux of the final chapter of the book. For technical reasons, we will focus solely on the classification trees in this chapter. We will also briefly look at some limitations of the CART tool.

One improvement of the CART is provided by the bagging technique. In this technique, we build multiple trees on the bootstrap samples drawn from the actual dataset. An observation is put through each of the trees and a prediction is made for its class, and, based on the majority prediction of its class, it is predicted to belong to the majority count class. A different approach is provided by random forests, where one compares a random pool of covariates against the observations. We finally consider another...

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