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How effective are COVID-19 vaccines? Here's what the stats mean … and what they don't

By Sorana Froda, Professeure Associée, Département de mathématiques; Chercheure émérite, STATQAM, Université du Québec à Montréal (UQAM)
Fabrice Larribe, Professeur de Statistique, Département de Mathématiques, Université du Québec à Montréal (UQAM)

Vaccine efficacy is usually expressed as a percentage, but what is it actually measuring? Statisticians explain what the numbers mean, and what they say about how well a vaccine can protect us.

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