Correlation versus Causation (as per xkcd)

While Businessweek had an interesting infographic on the difference between correlation and causation, xkcd provides a different take on the logical fallacy of cum hoc ergo propter hoc (correlation proves causation).

Correlation versus Causation (cum hoc ergo propter hoc)

Image by xkcd

In other words, correlation enables prediction whereas causation enables explanation. Correlation denotes the strength of a relationship between two variables, while causation requires correlation of cause and effect, temporal precedence and rejection of alternative hypotheses.

via Correlation versus Causation (cum hoc ergo propter hoc) « A little bit of this, a little bit of that.

 

Edit: Don’t forget the mouse-over text.

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Correlation versus Causation (cum hoc ergo propter hoc)

A picture is worth a thousand words. This wonderful image by Businessweek helps to convey the difference between correlation and causation in a much easier to understand manner as compared with standard research texts.

Image via BusinessWeek

 

In other words, correlation enables prediction whereas causation enables explanation. Correlation denotes the strength of a relationship between two variables, while causation requires correlation of cause and effect, temporal precedence and rejection of alternative hypotheses.

 

Thus that correlation proves causation, or, cum hoc ergo propter hoc, is a logical fallacy.

 

See the original at Correlation or Causation? – Businessweek.