104 
New Method of Correlation 
Thus the mothers are somewhat more likely to be employed if their sons are 
younger. This probably only means that the more well-to-do parents allow their 
children to stay longer at school. 
Employment of Mothers and Height of Sons. 
Height of 
Sons 
Mot 
Employed 
HERS 
Not 
Employed 
Height of 
Sous 
27-5 
1 
1 
51-5 
29-5 
1 
3 
4 
53-5 
SI- 5 
1 
8 
9 
55-5 
S3- 5 
4 
41 
45 
57-5 
35-5 
12 
154 
166 
59-5 
37-5 
46 
514 
560 
61-5 
S9-5 
111 
1261 
1372 
63-5 
Ji.1-5 
193 
2430 
2623 
65-5 
JfS-S 
230 
3376 
3606 
67-5 
288 
3738 
4026 
69-5 
Iff -5 
239 
3959 
4198 
71-5 
Jl9-5 
245 
4114 
4359 
73-5 
Totals 
Mothers 
Employed 
Not 
Employed 
205 
165 
70 
39 
8 
2 
1 
3860 
3296 
2207 
1234 
518 
158 
51 
21 
3 
4065 
3461 
2277 
1273 
526 
160 
51 
21 
4 
2 
2 
1 
1 
1 
1 
1860 
30951 
32811 
Mean Height of all Boys = 48-4827. 
Standard Deviation of all Boys = 5*3043. 
Mean Height of sons of employed mothers =47'0474. 
1 (!_«) = -0567, ^1 + a) = -9433, ^ = -1139. 
1-4353 -0567 
Miss Elderton finds by the product-moment method that the correlation of age 
and height for these boys is 
r«, = -8452. 
Finding the partial correlation coefficient between employment of mother and 
height of sons for a constant age of offspring, we have 
= -•1958. 
There is thus a quite sensible correlation for a given age of child between its 
stature and the increasing stress due to employment of mother. Miss Elderton 
will, however, indicate in her memoir some difficulties in the interpretation of this 
result. 
