Designing High Impact Data Visualizations

Hong QuHKS Communications workshop

February 20, 2020

Agenda• Ways to visualize information

• 5 step process

• Target <—> Data wrangling <—> Design <—> Implement <—> Evaluate

• Matching the data sets to types of graph

• Pre-attentive perception

• Narrative, storytelling, and shared understanding

• Demos and exercises

DPI-851M Data and Information Visualization

Pre-attentive Perception

Preattentive Attributes in Visualization – An Example

Actionable Insights

Few, Stephen. Now You See It: Simple Visualization Techniques for Quantitative Analysis

Data Visualization Skills

https://www.datarevelations.com/rethinkingdivergent.html

Visualizing Survey Data

https://www.datarevelations.com/rethinkingdivergent.html

Divergent Stacked Bar Chart

Jones, Ben. Communicating Data with Tableau

Choosing a Data Visualization Tool for Data Scientists

Media

Jones, Ben. Communicating Data with Tableau

5 Step process

The Power of Visualization

The Power of Visualization

Computational Information Design

–Jeffrey Heer, Michael Bostock, Vadim Ogievetsky

“The goal of visualization is to aid our understanding of data by leveraging the

human visual system’s highly tuned ability to see patterns, spot trends, and identify

outliers.”

A Tour Through the Visualization Zoo

Nathan Yau, Data Points, pages 144-145.

https://datavis.readthedocs.io/en/latest/visual_encoding.html

A study done showed that position (y, x axis) is the best, followed by length, angle and slope, area, volume, and lastly, color and density.

Working memory is extremely limited

~ 5 - 7 things

Combine Human cognitive capabilities

with Visually encoded data interfaces

dataremixed.com/books/cdwt/

Communicating Data with Tableau - 2012 NY Yankees Stats

Data Table

class exercise Tasks for data analysis

• Rank the top 10 players who hit the most home runs?

• What percent did any particular player contribute to the home run total for the team?

• What is the relationship between number of “At Bats” and Home runs?

• Players in which field positions tend to hit more home runs?

Metrics: • Task completion rate • Time to complete task • Number of errors

https://idl.cs.washington.edu/files/2012-VisualizationZoo-CACM.pdf

Hypothesis generation (sanity check the dataset)

(what, when, how, who, where)

Hypothesis formation

Hypothesis testing

Hypothesis validation

Domain knowledge and

Qualitative research insights (why, how)

[Experimentation (A/B test)][Synthesis]

Data Table - Sorted

Communicating Data with Tableau - 2012 NY Yankees Stats

Bar Chart

Communicating Data with Tableau - 2012 NY Yankees Stats

Pie Chart !

Stacked Bar Graph

Communicating Data with Tableau - 2012 NY Yankees Stats

Dot Graph in %

Waterfall Chart

Scatter Plot HR vs AB

Communicating Data with Tableau - 2012 NY Yankees Stats - Scatter Plot

CrossTab Highlight Chart

Communicating Data with Tableau - 2012 NY Yankees Stats - Scatter Plot

Peter Aldhous: Data visualization: basic principle

• Title and subtitle These provide context for the chart.

• Coordinate system For most charts, this is provided by the horizontal and vertical axes, giving a cartesian system defined by X and Y coordinates; for a pie chart it is provided by angles around a circle, called a polar coordinate system.

• Scale Labeled tick marks and grid lines can help your audience read data values.

• Labels You will usually want to label each axis. Think about other labels that may be necessary to explain the message of your graphic.

• Legend If you use color or shape to encode data, you will often need a legend to explain this encoding.

• Source information Usually given as a footnote. Don’t forget this!

Anatomy of a Chart

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3D Area Chart

Pie Chart Waterfall Chart Stacked 100% Column Chart

with Subcomponents

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Area Chart

Stacked

Column Chart

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Column Chart

Bubble Chart

Scatter Chart

Variable Width

Column Chart

Table or Table with

Embedded Charts

Bar Chart Column Chart

Column Histogram

Line Histogram

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FT Visual Vocabulary

Get data from http://www.irelandelection.com/

Demos

• Story of the 2020 election in Ireland

• Grid of line charts

• Column chart

• Bar chart race

• Line chart race

• Parliament chart

http://flourish.studio

http://bit.ly/covid-19-dataset

http://bit.ly/HKS_Comms_files

Google search for: “John Hopkins COVID-19 github”