Observatoire des droits humains (anglais seulement)

What is a p-value? An expert explains the most misunderstood number in science

(Version anglaise seulement)

par Kyle Hewitt, Neuroscientist and Associate Lecturer specialising in neuropsychopharmacology, University of Wollongong

If you’ve ever tried to read a scientific paper, you’ve almost certainly run into a p-value. And if you found it confusing, you’re in good company: plenty of working scientists misunderstand it too.

The p-value is a number measuring the “statistical significance” of an experiment, and it’s often treated as the adjudicator of whether the experiment really found something or not. It decides whether researchers get to say that a drug did something, or that one group differed from another.

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