“Trends, forests and trees”

Sunday, 7 April 2013-Doctor Skeptic
http://doctorskeptic.blogspot.com/2013/04/trends-forests-and-trees.html

“There are many reasons why things actually get better, and why they might be perceived as getting better, so don’t jump to conclusions about causation when you see a before-and-after study. And the next time you are presented with data showing how things have improved since the introduction of [INSERT INTERVENTION HERE], ask for the long term trends, look for other explanations, and just for fun, suggest that things might continue to improve, even if we stop the intervention.”

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