Book Image

R Data Analysis Projects

Book Image

R Data Analysis Projects

Overview of this book

R offers a large variety of packages and libraries for fast and accurate data analysis and visualization. As a result, it’s one of the most popularly used languages by data scientists and analysts, or anyone who wants to perform data analysis. This book will demonstrate how you can put to use your existing knowledge of data analysis in R to build highly efficient, end-to-end data analysis pipelines without any hassle. You’ll start by building a content-based recommendation system, followed by building a project on sentiment analysis with tweets. You’ll implement time-series modeling for anomaly detection, and understand cluster analysis of streaming data. You’ll work through projects on performing efficient market data research, building recommendation systems, and analyzing networks accurately, all provided with easy to follow codes. With the help of these real-world projects, you’ll get a better understanding of the challenges faced when building data analysis pipelines, and see how you can overcome them without compromising on the efficiency or accuracy of your systems. The book covers some popularly used R packages such as dplyr, ggplot2, RShiny, and others, and includes tips on using them effectively. By the end of this book, you’ll have a better understanding of data analysis with R, and be able to put your knowledge to practical use without any hassle.
Table of Contents (15 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Use case and data


The Jester5k dataset is what we will be using to build our recommender system using collaborative filtering. It contains user ratings in the scale of -10 to 10 for several jokes. In this chapter, we will use these ratings as an input and produce ratings for jokes which the users have not seen or not rated before. For more information about the Jester5k dataset, visit: http://www.ieor.berkeley.edu/%7Egoldberg/jester-data/

Fortunately, a sample of this data is available with the recommenderlab package.

Let us quickly look at this data:

> library(recommenderlab, quietly = TRUE)
> data("Jester5k")

> str(Jester5k)
Formal class 'realRatingMatrix' [package "recommenderlab"] with 2 slots
  ..@ data     :Formal class 'dgCMatrix' [package "Matrix"] with 6 slots
  .. .. ..@ i       : int [1:362106] 0 1 2 3 4 5 6 7 8 9 ...
  .. .. ..@ p       : int [1:101] 0 3314 6962 10300 13442 18440 22513 27512 32512 35685 ...
  .. .. ..@ Dim     : int [1:2] 5000 100
  .. .. ..@ Dimnames...