Appendix 311 



27. Calculation of the moments of the distribution of deaths by 

 age for a population of mice (Greenwood, 1928) shows that a Pearson 

 type III (gamma function) would give a fair representation, but, as 

 with the himian data, the curve is the "opposite way round", i.e. 

 subject to a terminal age. By inference the Perks (logistic) curve 

 would give a fair representation of this data. No calculations have 

 been made on animal data or on physical objects such as electric 

 light bulbs and motor cars (e.g. Cramer, 1958) but it would seem 

 worth while trying to find out if observed data of this latter type 

 would distinguish between the two types of processes. 



REFERENCES 



Beard, R. E. (1936). J. Inst. Acta., 67, 53. 

 Beard, R. E. (1939a). J. Inst. Actu., 70, 53. 

 Beard, R. E. (19396). J. Inst. Actu., 70, 373. 

 Beard, R. E. (1950). Proc. Centen. Assembl. Inst. Acta., 2, 89. 

 Beard, R. E. (1951«). J. Inst. Actu., 77, 382. 

 Beard, R. E. (1951b). J. Inst. Actu., 77, 394. 

 Beard, R. E. (1952«). J. Inst. Actu., 78, 82. 

 Beard, R. E. (19526). J. Inst. Actu., 78, 201. 

 Beard, R. E. (1952c). J. Inst. Actu., 78, 341. 

 Cramer, J. S. (1958). J. R. statist. Soc, 121, 18. 

 Gompertz, B. (1825). Phil. Trans., 115, 513. 

 Greenwood, M. (1928). J. Hyg. (Lond.), 28, 282. 

 Makeham, W. M. (1867). J. Inst. Actu., 13, 325. 

 Mortality of Assured Lives (1956). J. Inst. Actu., 82, 3. 

 Papers of Royal Commission on Population (1950). 2, 154. 

 Perks, W. (1932). J. Inst. Actu., 63, 12. 

 Perks, W. (1953). J. Inst. Actu., 79, 199. 



Registrar General's Decennial Supplement, England and Wales 1951, 

 Review in J. Inst. Actu., 83, 168 (1957). 



