« Football madness | Main | The meaning of pretty pictures and the case of 15 scales »



Fabulous! Looks like 328 is about 25% larger than 327! I did not know that.

Dan Goldstein

I think the link is suppose to be http://www.decisionsciencenews.com/2011/07/03/best-graph-ever/


First of all, congratulations on finding such an amazing stream of terrible charts as cautionary tales. This bar chart is inexcusable and the title of the post is perfect!

I am not sure I agree with your absolute admonition that "For bar charts, one must start at zero... no exceptions." I would agree that this is something that should only be done for a good reason, but I am not sure about never...

Would you never plot temperatures (or other interval scale variables) on a bar chart? How about on a line chart? Or would you always include the 0 Kelvin baseline?

What if you were comparing variables with a non-zero lower bound (say SAT scores across school districts or credit scores of mortgage applicants over time).

What about variables with fuzzy lower bounds - say IQ scores or cholesterol levels? Say you wanted to compare cholesterol levels across ethnic groups? Or test whether the IQ of military recruits went down as the military strained under the weight of two wars? What if you know that the military has an 85IQ point minimum requirement?


My graphic design friend was once tasked with a graphic that was to include a bar chart. He asked me to critique it, and the first thing I told him was "you need to use a proper scale for your bar chart". He didn't start the scale at some non-zero number - he just used arbitrary lengths for the bars. The order was correct, but he really didn't even make an effort to get the lengths right - because it honestly didn't occur to him that he should have.

This may not be too common, but it does happen.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)


Link to Principal Analytics Prep

See our curriculum, instructors. Apply.
Marketing analytics and data visualization expert. Author and Speaker. Currently at Columbia. See my full bio.

Book Blog

Link to junkcharts

Graphics design by Amanda Lee

The Read

Good Books

Keep in Touch

follow me on Twitter