# Misleading Graphs - PowerPoint PPT Presentation

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Misleading Graphs. Know the dirty tricks so you won’t be deceived. There’s an entire blog!. www.forbes.com/sites/naomirobbins She even had a “Bad Graph Contest” http://www.forbes.com/sites/naomirobbins/2012/05/30/winner-of-the-bad-graph-contest-announced-2/ . Manipulate the Vertical Axis.

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#### Presentation Transcript

Know the dirty tricks so you won’t be deceived

### There’s an entire blog!

• www.forbes.com/sites/naomirobbins

### Manipulate the Vertical Axis

Original

Vertical axis chopped

Magnify differences

Distort proportionality

### Manipulate the vertical axis

Original

Vertical axis extended

Everybody seems shorter

Tax the rich, spread the poverty

### Manipulate the Data Selection

Original

Chopped off some years

Choose a beginning year to make it look like there’s been astounding growth.

Or to make it look like there’s been little growth.

### Manipulate the Horizontal Axis

Original

Stretch or compress

Make slopes (rates of change) look steeper (compress the axis) or more gradual (stretch the axis)

### Graphic Arts Overkill

• 3-D perspectives that distort plain meaning

### More web references

• http://grandgraphs.tumblr.com/

• http://flowingdata.com/

• http://flowingdata.com/2012/05/23/venn-pie-agrams/

• http://flowingdata.com/2012/06/25/chart-chooser-helps-you-choose-charts/