Book Image

R Statistics Cookbook

By : Francisco Juretig
2 (2)
Book Image

R Statistics Cookbook

2 (2)
By: Francisco Juretig

Overview of this book

R is a popular programming language for developing statistical software. This book will be a useful guide to solving common and not-so-common challenges in statistics. With this book, you'll be equipped to confidently perform essential statistical procedures across your organization with the help of cutting-edge statistical tools. You'll start by implementing data modeling, data analysis, and machine learning to solve real-world problems. You'll then understand how to work with nonparametric methods, mixed effects models, and hidden Markov models. This book contains recipes that will guide you in performing univariate and multivariate hypothesis tests, several regression techniques, and using robust techniques to minimize the impact of outliers in data.You'll also learn how to use the caret package for performing machine learning in R. Furthermore, this book will help you understand how to interpret charts and plots to get insights for better decision making. By the end of this book, you will be able to apply your skills to statistical computations using R 3.5. You will also become well-versed with a wide array of statistical techniques in R that are extensively used in the data science industry.
Table of Contents (12 chapters)

Introduction

Unfortunately, parametric methods such as the t-test or ordinary least squares (OLS), make very strong assumptions about the distribution of the data. To some extent, they still work if the distributional assumptions are relaxed, but it really depends to which extent these assumptions are violated.

Nonparametric methods do not work with the usual parametrized distributions and are instead designed to work with any distribution. This gives them a distinct flexibility, and we are no longer required to check any distributional assumption on the data. If the data follows the same distribution that its parametric counterpart requires, they usually perform almost as well.