Book Image

Regression Analysis with R

By : Giuseppe Ciaburro
Book Image

Regression Analysis with R

By: Giuseppe Ciaburro

Overview of this book

Regression analysis is a statistical process which enables prediction of relationships between variables. The predictions are based on the casual effect of one variable upon another. Regression techniques for modeling and analyzing are employed on large set of data in order to reveal hidden relationship among the variables. This book will give you a rundown explaining what regression analysis is, explaining you the process from scratch. The first few chapters give an understanding of what the different types of learning are – supervised and unsupervised, how these learnings differ from each other. We then move to covering the supervised learning in details covering the various aspects of regression analysis. The outline of chapters are arranged in a way that gives a feel of all the steps covered in a data science process – loading the training dataset, handling missing values, EDA on the dataset, transformations and feature engineering, model building, assessing the model fitting and performance, and finally making predictions on unseen datasets. Each chapter starts with explaining the theoretical concepts and once the reader gets comfortable with the theory, we move to the practical examples to support the understanding. The practical examples are illustrated using R code including the different packages in R such as R Stats, Caret and so on. Each chapter is a mix of theory and practical examples. By the end of this book you will know all the concepts and pain-points related to regression analysis, and you will be able to implement your learning in your projects.
Table of Contents (15 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Chapter 5. Data Preparation Using R Tools

Real world datasets are very varied: variables can be textual, numerical, or categorical and observations can be missing, false, or wrong (outliers). To perform a proper data analysis, we will understand how to correctly parse a dataset, clean it, and create an output matrix optimally built for regression. To extract knowledge, it is essential that the reader is able to create an observation matrix, using different techniques of data analysis and cleaning.

In the previous chapters, we analyzed how to perform a single and multiple regression analysis while how to carry out a multiple and multinomial logistic regression. But in all cases analyzed, to get the correct indication from the models, the data must be processed in advance to eliminate any anomalies.

In this chapter, we will explore the data preparation techniques to obtain a high- performing regression analysis. To do this, we have to get the data into a form that the algorithm can use to build...