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Chart junk - Throw it out!

Date post: 07-Jul-2015
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'Chart junk’ is a feature of a chart or graph that doesn’t help you understand the data. Getting rid of chart junk is a basic data visualisation rule. This presentation shows how to make-over a graph to eliminate the chart junk and make it quicker and easier to read.
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Page 1: Chart junk - Throw it out!
Page 2: Chart junk - Throw it out!
Page 3: Chart junk - Throw it out!

This graph is readable..

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Page 4: Chart junk - Throw it out!

..but takes a bit of time to understand.

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Page 5: Chart junk - Throw it out!

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

3D is a real

gimmick

Page 6: Chart junk - Throw it out!

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

These lines

clutter the view

Page 7: Chart junk - Throw it out!

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Sloping text takes

a bit longer to

read

Page 8: Chart junk - Throw it out!

If we remove the chart junk, you’ll be able to read the graph quicker.

Page 9: Chart junk - Throw it out!

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Dump the 3D effects

Page 10: Chart junk - Throw it out!

0500

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Black on white is easier to

read

Page 11: Chart junk - Throw it out!

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United Future

The Civilian Party

NZ Independent Coalition

New Zealand First Party

National Party

Māori Party

Labour Party

Internet MANA

Green Party

Focus New Zealand

Democrats for Social Credit

Conservative

Ban1080

Aotearoa Legalise Cannabis Party

ACT New Zealand

Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Horizontal text is quicker to read than

angled text

Page 12: Chart junk - Throw it out!

0 500 1000 1500 2000 2500 3000 3500 4000 4500

Democrats for Social Credit

Focus New Zealand

NZ Independent Coalition

Ban1080

The Civilian Party

Aotearoa Legalise Cannabis Party

United Future

ACT New Zealand

Māori Party

Conservative

Internet MANA

New Zealand First Party

Labour Party

Green Party

National Party

Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Size order is quicker to

read for this graph than alphabetical

Page 13: Chart junk - Throw it out!

1

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2

4

10

26

34

68

79

144

166

385

2423

3451

4278

Democrats for Social Credit

Focus New Zealand

NZ Independent Coalition

Ban1080

The Civilian Party

Aotearoa Legalise Cannabis Party

United Future

ACT New Zealand

Māori Party

Conservative

Internet MANA

New Zealand First Party

Labour Party

Green Party

National Party

Ordinary votes cast before Election Day 2014 Wellington Central Electorate

You can show the values without clutter

Page 14: Chart junk - Throw it out!

Before:

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Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Page 15: Chart junk - Throw it out!

After:

1

2

2

4

10

26

34

68

79

144

166

385

2423

3451

4278

Democrats for Social Credit

Focus New Zealand

NZ Independent Coalition

Ban1080

The Civilian Party

Aotearoa Legalise Cannabis Party

United Future

ACT New Zealand

Māori Party

Conservative

Internet MANA

New Zealand First Party

Labour Party

Green Party

National Party

Ordinary votes cast before Election Day 2014 Wellington Central Electorate

Page 16: Chart junk - Throw it out!

Eliminating chart junk improves a graph’s ‘data-ink ratio’ – a term coined by Edward Tufte in the 1980s.

Page 17: Chart junk - Throw it out!

It’s the ratio of data-ink to non-data-ink.

The better the ratio, the easier the graph is to read.

Page 18: Chart junk - Throw it out!

With flashy, distracting Excel graphs only a click away, chart junk and the data-ink ratio are useful concepts to keep in mind.

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For more information try:Edward TufteStephen FewStephanie Evergreen

Page 20: Chart junk - Throw it out!

Feedback [email protected]


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