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Jose Berengueres - Introduction to Data Visualization & Storytelling: A Guide For The Data Scientist

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Jose Berengueres Introduction to Data Visualization & Storytelling: A Guide For The Data Scientist

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Introduction to Data Visualization & Storytelling

A Guide For The Data Scientist

Jose Berengueres

with

Marybeth Sandell &

Ali Fenwick

nd Edition

Type setting by SNASK

Text Copyright Jose Berengueres

Where otherwise stated, artworks,

cover & drawings by Jose Berengueres

Data, value creation & thinking modes

TOC TOC Preface It was May 2018 when I received an email from Kagglecom - photo 1

TOC

TOC

Preface

It was May 2018 when I received an email from Kaggle.com , a data science community where people all over the world compete in data modelling challenges. Every year since 2017, Kaggle has surveyed its users and this year they decided to organize a storytelling competition and offer cash prizes for the best survey visualization. I was curious to see what people had submitted so far and sifted through the entries. I was impressed at how much time and effort had been put into analyzing the data. Some charts required laborious data wrangling, others crafty SQL inner joins, and some Python sorcery. And yet, the charts were not doing justice to the compelling findings and the stories that could be told. No doubt, some were creative, extensive in length, exhaustive in the exploration. However, there were also many unimpressive charts. Why was so much IQ not producing more enticing visualizations?

Its about the awareness

80% of the data scientists graduating today will do so without having received any formal education on storytelling , and 60% of them place data visualization at the bottom of their priority list of skills to have. In addition, the fact that most data science is taught at STEM schools, not Art schools, does not help either. (Really, STEM schools should aspire to be STEAM schools, to include Art). In order to improve the quality of data visualization, there must be a change in how data scientists are trained along with a mind shift regarding the imperative of good story telling. However, to make effective visualizations, art sensibility is not all that is needed.

Death by default settings

A second cause, is that the gallery of default chart styles of Microsoft Excel is unlikely to match what is required to tell the story .

Start with why

A third cause, is that to produce a meaningful visualization we need to know why we are visualizing. To get to the why, its important to explore the story that needs to be told and be able to make it relevant.

To succeed at transforming data into a compelling and relevant story, it helps to connect the data to a context, metaphor or mental framework (frameworks from Economics, Art, and Sociology are particularly useful). In order to make these connections, a cross-functional education is necessary. Unfortunately, this is not the norm resulting in loads of very interesting data failing to become useful knowledge. To address this, in the following pages you will find a set of principles by example that I wish I had learned in grad school.

Happy visualizations Jose Berengueres Stockholm Oct 25th 2019 How to - photo 2

Happy visualizations!

Jose Berengueres

Stockholm, Oct 25th 2019


How to use this book
What will you learn
  1. Identify the role of a narrative in a chart
  2. Transform data into information
  3. Synthesize knowledge
  4. Apply visual thinking tools to the decision-making process
  5. Select visual communication techniques to persuade
Updates to this edition

This edition adds two new chapters, one on bias by Marybeth Sandell and one on Psychology by Ali Fenwick. Whether you are using this book as course material for a data visualization course, in journalism, or in a data science minor; this is a solid foundation before getting hands on with Tableau, Excel or Python Pandas. We have also upgraded all the images to 600 DPI.

Exercises

There are several exercises in this book so it is helpful to have paper and black fiber tip pen 0.5-0.7mm such as Pilot EF or a Pilot Sign Pen available.

Slides

This book was born out of workshop full color slides that you can use in the classroom. To get them send an email to with subject DATAVIZ101 and link to your verified purchase review on Amazon.


Chapter 1 . Stories, Data & Narratives

Finding the purpose of the chart

Fig 1 These three magazines publish some of the most influential charts in the - photo 3

Fig 1 These three magazines publish some of the most influential charts in the newsstand. None of them is made with Excel .

Before you start

Before visualizing, there is data. However, before working with data it is important to understand what knowledge is. What is knowledge to you? In this chapter, you will learn three things; (i) the difference between: data, information and knowledge; (ii) What wisdom is; and (iii) What the process to produce knowledge is.

What is data?
Exercise

What is data to you? We always open data visualization workshops with this exercise.

Fig 2 An exercise to understand what data is by relating it to knowledge - photo 4

Fig 2 An exercise to understand what data is by relating it to knowledge.

Data has many definitions. However, to understand, theres nothing like doing an exercise. There are various ways to learn something. By listening, by talking about it, by reading about it and, by doing it. Of those four, doing has the highest recall rate. Can you order the four words (data knowledge information wisdom)? Most students will come up with the following ordering:

data > information > knowledge > wisdom

Once the order of the words has been agreed, we can discuss the ordering criteria. Why did we order them the way we did? This is a great conversation starter. To ground the conversation, it further helps to list the attributes of the words at the extremes. What are the attributes that distinguish data vs. wisdom?

Data vs. wisdom
Exercise

Fig 3 An exercise used to understand the arrow of value between data and wisdom - photo 5

Fig 3 An exercise used to understand the arrow of value between data and wisdom .

Solution

Fig 4 The arrow of value What is wisdom Data is many while wisdom is - photo 6

Fig 4 The arrow of value.

What is wisdom?

Data is many while wisdom is usually characterized by few . Data is abundant, wisdom is scarce. Value is closely correlated with scarcity too. This exercise is great to clarify the pervasive confusion between data, information, knowledge and its relationship to value, scarcity and wisdom.

How is wisdom made?

Fig 5 This arrow represents a process Jackie Chan says in one of his films - photo 7

Fig 5 This arrow represents a process.

Jackie Chan says in one of his films, information is not knowledge, and knowledge is not wisdom. But what is wisdom? Is wisdom just knowledge in context? Is wisdom meta knowledge? knowledge about knowledge? And more importantly, knowing in which situation to apply a given knowledge? Even if the definition is not universal, what we are more interested in here is how to transform knowledge into wisdom. Why? Because it is a high added value activity and one of the reasons (if not the only reason) why companies employ data scientists. One way to arrive at wisdom is the Synthesis process the dialectic combination of thesis and antithesis into a higher truth.

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