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More than a century after William Farr’s 1838 publication “On prognosis”, the difference between “risk” and “rate” was rediscovered by epidemiologists in the 1970s. The concept of the incidence rate over person-time continues to be misunderstood and has led to recent controversies.

Continuing controversies over "risks and rates" ? more than a century after William Farr's "On prognosis"