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Presenting data visualizations Datalicious, 17 th December 2014

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Presenting data visualizationsDatalicious, 17th December 2014

quantilicious

“The greatest value of a picture is when it

forces us to notice what we never expected

to see.” - John Tukey, 1977

Today

Presenting visualizations in PowerPoint decks

Dealing with graphical complexity

Common visualization pitfalls

Tufte’s data-ink ratio

3

Presenting Visualizations

in PowerPoint Decks

quantilicious

“The purpose of visualization is insight, not pictures”

― Ben Shneiderman

Presenting Visualizations in PowerPoint Decks

Serve your insights on a platter

Stay brief and to the point

Know when to move on

Be prepared to shift course

6

Tell a consistent story

Have supporting slides ready to go

Do the cognitive work for your audience

Provide memorable ‘takeaway’ sound bites

Serve Your Insights on Platter

7

CEO salary has risen and fallen over time

Serve Your Insights on Platter

8

CEO salary has risen and fallen over time

• Not clear whether the insight is referring to Average Salaries or Maximum Salaries

• Forces the reader to do the work

• No time reference

• Does not tell the whole story (maximum salary rose, then fell, then rose again)

Insight Generation Tips

Point to the trend, outlier or feature

Describe the trend, outlier or feature

Refer to the greater context that may

not feature in the data

9

Include a time reference

Add value beyond what is obvious on the chart

Leave no chart variable behind

Serving Your Insights on a Platter

10

Maximum salaries fell over

2008-2009, coinciding with

the GFC.

Whilst maximum

salaries recovered in

2012, they have still not reached pre-GFC levels.

On average, CEO salaries

have not increased in real

terms over 2007-2012

Show Your Insights

11

Maximum salaries fell over

2008-2009, coinciding with

the GFC.

Whilst maximum

salaries recovered in

2012, they have still not reached pre-GFC levels.

On average, CEO salaries have not increased in real terms over the

previous 6 yearsGFC

Super Smash Brothers Melee Character

Rankings

Super Smash Brothers Melee Consistent High Performers

Super Smash Brothers Melee Consistent High Performers

Consistent high

performers

remained in the

top 5 over the

study duration

Super Smash Brothers Melee Biggest Improvers

Super Smash Brothers Melee Biggest Decliners

Create Memorable Soundbites

17

“Jollibee has gained 5% market share relative to McDonalds”

“Digital marketing spend consumed a greater proportion of the total marketing budget.”

“Jollibee fries 5% from Macca’s Market Share”

“From data to dollars: digital marketing is an increasingly important channel”

Borders vs Amazon Growth and

Volume

18

Amazon

Borders

Borders Has Drowned in the Amazon

19

Dealing with Graphical Complexity

Higher Levels of Chart Complexity

21

Dual Axes Charts OK

Know your subject matter

Serve your insights on a platter

Insights with Higher Levels of Chart Complexity

22

More opportunities

closed in April-May led to higher sales revenue in

May-June (EOFY)

More opportunities lost in July-August followed by a

period of low sales

End of Financial Year

Dual Axes, Quad Variable Time Series and Bar

Chart

23

0

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Sa

les

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nts

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r U

nit

/ %

Dis

trib

uti

on

/ T

VR

s

Week

TVRs Price Distribution Volume Sales

Staged Introduction of Layered Time

Series

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nts

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Staged Introduction of Layered Time

Series

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0.00

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Ce

nts

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r L

itre

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Dis

trib

uti

on

Week

Price Distribution

Staged Introduction of Layered Time

Series

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0

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TV

Rs

Week

Series1

Staged Introduction of Layered Time

Series

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0

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Sa

les

TV

Rs

Week

TVRs Volume Sales

Staged Introduction – The Final

Product

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0

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trib

uti

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/ T

VR

s

Week

TVRs Price Distribution Volume Sales

Paste as Excel Objects

29

Hover for exact values

Give Upper Management ownership of your numbers (to push your business case)

Delete variables on the fly

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

0.00

10.00

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1 6 11 16 21

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Sa

les

Ce

nts

Pe

r U

nit

/ %

Dis

trib

uti

on

/ T

VR

s

Week

Price Volume Sales

Common Visualization Pitfalls

Issues with 3D Visualization

3D Can Be Misleading

31

3D Can Be Misleading

32

Issues with 3D Visualization

3D Pie Charts = Visual Bias

33

Poll:

Issues with 3D Visualization

quantilicious

“Above all else show the data.”―Edward Tufte

Avoid 3D, Avoid Tilt

35

Resist 3D and Tilt Temptations

3 Fictitious Firms

36

Axis Scaling and Origin Setting

3 Fictitious Firms

37

Pay Attention to Scale Width and

The Origin

Which chart shows the most accurate trend?

38

Axis Scaling

39

$60.0

$66.2

$79.2 $81.6$76.8 $79.2

$84.0 $84.0 $84.0 $81.6 $79.2

0

10

20

30

40

50

60

70

80

90

Co

mp

any

Val

uat

ion

($

Bill

ion

s)

Facebook, Inc.: Company Valuation

Be Mindful of Gridlines and Borders

If there are significant differences in the slice sizes, a pie chart can be OK (although a bar chart is better)

40

Pies vs Bars

Tufte’s Data-Ink Ratio

Data-Ink Ratio Formula

43

44

The Data Ink Ratio

Further Reading

If you want to just read one book, make it this one

45

Further Reading

46

Thank You