Ladislaus Bortkiewicz
Ladislaus Josephovich Bortkiewicz (August 7, 1868 - July 15, 1931) was a Russian economist and statistician of Polish descent.
Bortkiewicz was born in St. Petersburg, Imperial Russia (today Russia) where he graduated in law in 1890.
In 1898 he published a book about the Poisson distribution, titled The Law of Small Numbers. In this book he first noted that events with low frequency in a large population follow a Poisson distribution even when the probabilities of the events varied. It was that book that made the Prussian cavalry horse-kick data famous. The data give the number of soldiers killed by being kicked by a horse each year in each of 14 cavalry corps over a 20-year period. Bortkiewicz showed that those numbers follow a Poisson distribution. The book also examined data on child-suicides. Some historians of mathematics have argued that the Poisson distribution should have been named the "Bortkiewicz distribution."
Bortkiewicz died in Berlin, Germany.
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