M. Beeton and K. Pearson 
61 
From this table the following equations, giving the probable age at death 
of male and female individuals when the ages at death of certain of the relatives 
are known, have been determined. 
Prediction of Age at Death. 
Let M = probable age at death of a man. 
W = „ „ „ „ woman. 
F — known age at death of father. 
M = „ „ „ „ mother. 
>S'o = „ „ „ „ son. 
D = „ „ „ „ daughter. 
^o', D' = known ages at death of other sons and daughters. 
B, B' = „ „ „ brothers. 
Si, Si = ,, „ „ sisters. 
All the above capital letters mark individuals who live to be 21 or more. 
Sq = known age at death of minor son. 
d = „ „ „ minor daughters. 
So', d — known ages at death of other minors, sons and daughters. 
m = probable age at death of a male minor. 
w = „ „ „ „ female minor. 
b, h' = known ages at death of minor brothers. 
Si, Si = „ „ „ minor sister.s. 
All the above small letters mark individuals who die at or before 21 years. 
S = standard deviation of the array of individuals having the probable age at 
death given by the equation. 
TABLE B. 
(1) 
M 
= 41-170 + -1802 F 
19-3906 
(2) 
M 
= 44-268 + -1480 M 
18-9598 
(3) 
M 
= 31-500 + -1802 -1486 M 
190009 
(4) 
W 
= 38-229 + -2057 F 
21-4284 
(5) 
W 
= 39-861 + -1914 if 
V 
20-8074 
(6) 
W 
= 25-317 + -2057 F+ -1914 M 
20-9056 
(7) 
M 
= 62 935 + -1016 S, 
14-5622 
(8) 
M 
= 65-229 + -0822 D 
13-5487 
(9) 
M 
= 59-427 + -0790 (>S'„ + ^o') 
V 
13-8845 
(10) 
M 
= 61-058 + -0805 >S'o + -0684 B 
V 
13-5959 
(11) 
M 
= 62-415 + -0617 {D + A') 
V 
12-6697 
(12) 
M 
= 62-706 + -2059 s. 
15-1260 
(13) 
M 
= 62-813 + -1208 d 
15-8225 
(14) 
M 
= 62-117 + -1867 (so + SoO 
2 
14-9999 
