Book Image

R for Data Science Cookbook (n)

By : Yu-Wei, Chiu (David Chiu)
Book Image

R for Data Science Cookbook (n)

By: Yu-Wei, Chiu (David Chiu)

Overview of this book

This cookbook offers a range of data analysis samples in simple and straightforward R code, providing step-by-step resources and time-saving methods to help you solve data problems efficiently. The first section deals with how to create R functions to avoid the unnecessary duplication of code. You will learn how to prepare, process, and perform sophisticated ETL for heterogeneous data sources with R packages. An example of data manipulation is provided, illustrating how to use the “dplyr” and “data.table” packages to efficiently process larger data structures. We also focus on “ggplot2” and show you how to create advanced figures for data exploration. In addition, you will learn how to build an interactive report using the “ggvis” package. Later chapters offer insight into time series analysis on financial data, while there is detailed information on the hot topic of machine learning, including data classification, regression, clustering, association rule mining, and dimension reduction. By the end of this book, you will understand how to resolve issues and will be able to comfortably offer solutions to problems encountered while performing data analysis.
Table of Contents (19 chapters)
R for Data Science Cookbook
About the Author
About the Reviewer

Understanding basic syntax and grammar

The ggvis uses similar grammar and syntax to ggplot2, and we can use this basic syntax to create figures. In this recipe, we cover how to use ggvis syntax and grammar to build advanced plots.

Getting ready

Ensure you have installed and loaded ggvis into your R session. Also, you need to complete the previous steps by storing house in your R environment.

How to do it…

Please perform the following steps to create plots with ggvis:

  1. First, create a scatterplot by mapping Size to the x axis and Price to the y axis. Furthermore, we can assign different colors or shapes to points with different statuses:

    > house %>% ggvis(~Size, ~Price, fill=~Status, size=10, shape=~Status) %>% layer_points()

    Figure 11: A scatterplot in different shapes and colors by housing status

  2. Also, we can use the add_props function to change the fill color to red:

    > house %>% ggvis(~Size, ~Price, fill=~Status, size=10, shape=~Status) %>% layer_points() %>% add_props(fill...