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William Farr (1807—1883) statistician and epidemiologist

 

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Farr's laws


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William Farr demonstrated that epidemics decline at a mathematically predictable rate, using empirical observations of a smallpox epidemic to confirm this. He later formulated several other mathematical equations and laws that apply to epidemics, e.g., that prevalence of a disease can be calculated from the mathematical product of incidence and the average duration.


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