Learn different strategies for plotting big data using ggplot2, including calculating and plotting summary statistics, various techniques to deal with overplotting, and principles of small multiples with faceting, which leads into Trelliscope.

Visualizing summaries

Daily ride counts

Distribution of cab fare amount

Distribution of payment type

Adding more detail to summaries

Relationship between trip duration and total fare

Faceting daily rides

Tip amount distribution faceted by payment type

Visualizing subsets

Comparing fare distribution by payment type

Visualizing all subsets

General strategies for visualizing big data

In the previous chapter you saw how faceting can be used as a powerful technique for visualizing a lot of data that can be naturally partitioned in some meaningful way. Now, using the trelliscopejs package with ggplot2, you will learn how to create faceted visualizations when the number of partitions in the data becomes too large to effectively view in a single screen.

Faceting with TrelliscopeJS

Trelliscope faceting gapminder by country

Interacting with the TrelliscopeJS displays

Interacting with the display

Additional TrelliscopeJS features

Customizing the gapminder display

Examining the new cognostics

Adding your own cognostics

Adding custom cognostics

Interpreting custom cognostics

ggplot2 + TrelliscopeJS

The ggplot2 + trelliscopejs interface is easy to use, but trelliscopejs also provides a faceted plotting mechanism that gives you much more flexibility in what plotting system you use and how to specify cognostics. You will learn all about that in this chapter!

Trelliscope in the tidyverse

Grouping and nesting

Stock price display

Exploring the display

Cognostics

Adding cognostics

Cognostics from nested data frames

Navigating stock plots with new cognostics

Trelliscope options

Customizing the stock display

Visualizing databases of images

Visualizing Pokemon

The most powerful Pokemon

Trelliscope in the Tidyverse

<a href="https://www.bixi.com" target="_blank">The Montreal BIXI bike network</a> provides open data for every bike ride, including the date, time, duration, and start and end stations of the ride. In this chapter, you will analyze data from over 4 million bike rides in 2017, going between 546 stations. There are many interesting exploratory questions to ask from this data and you will create exploratory visualizations ranging from summary statistics to detailed Trelliscope visualizations that will give you interesting insight into the data.

Montreal BIXI bike data

Number of daily rides

Examining time-of-day

Effect of membership and weekday

Summary visualization recap

Daily plots

Looking at all days

Top 100 routes dataset

Augmenting the data: Route summary statistics

Visualizing the data: Counts by hour-of-day

Evaluating the visualization

Au revoir

Case Study: Exploring Montreal BIXI Bike Data

Bikes

Pokémon

Top 100 routes

Stocks

Taxi rides

Having honed your visualization skills by learning ggplot2, it's now time to tackle larger datasets. In this course, you will learn several techniques for visualizing big data, with particular focus on the scalable visualization technique of faceting. You will learn how to put this technique into action using the Trelliscope approach as implemented in the trelliscopejs R package. Trelliscope plugs seamlessly into standard R workflows and produces interactive visualizations that allow you to visually explore your data in detail. By the end of this course, you will be able to easily create interactive exploratory displays of large datasets that will help you and your colleagues gain new insights into your data.

Interpreting custom cognostics

Visualizing Big Data with Trelliscope in R

Hands-on interactive exercise