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Our new paper shows how 1 in 5 people categorically misinterpret bar graphs. A thread...

Press release: wellesley.edu/news/journalis…

Paper: jov.arvojournals.org/article.aspx?a…

#DataViz #DataJournalism #BarBarGraphs
When shown a bar graph that depicts average values, 1 in 5 people think that the bar's tip is the outer limit of the data, rather than the balanced center point (the average), as if every individual value was below-average. We call this error the "Bar-Tip Limit Error."
How could decades of graph interpretation research have missed such a severe error? Our experience in psychological measurement led us to ask a more concrete, direct, detailed question than prior work.
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