4 The Prussian horsekick data The derivation of the Poisson

4. The Prussian horse-kick data:

The derivation of the Poisson distribution that we did in class is due to Poisson. However, this

distribution did not see much application until a text by Bortkiewicz in 1898. One famous

example from that text is the use of the

mean=0.61

x	no. of groups with this many deaths	Relative frequency	weighted values
0	109	0.545	59.405
1	65	0.325	21.125
2	22	0.11	2.42
3	3	0.015	0.045
4	1	0.005	0.005
			16.6	weighted mean