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Tuesday, August 04, 2009

Another bad graph

How misleading is this graph?



The problem is that the vertical axes have been manipulated to create an "intersection" where no intersection need exist. Indeed, one could adjust either vertical axis to obtain an "intersection" at some other point in time.

From this blog post

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The bigger problem is of variable measurement: One is ratio scale (percent of population); one is interval scale (population). What's surprising about the uninsured is that the percentage there is pretty flat over the last 20 or so years. (15-17%)
 
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