A. Ritchie-Scott 
133 
table is too extensive for reproduction and may be found in loc. cit. A condensed 
form of it will be found in Biometrilm, vol. ix, 1913, p. 223, Table XVIII. 
This was selected as an example of a very skew distribution. The correlation 
coefficient found by Product Moments is -780 {Bioynetrilm, vol. ix, p. 223). 
M. Table IV divided so as to give a reasonably large frequency in the cell n^^ ■ 
The mean falls in the cell n.,^ . 
30-1" and over 
30"-29-8" 
29-7" and under 
Total 
29-9" and over 
1086-5 
412 
43 
1541-5 
29-8"-29-7" 
144-5 
275 
103 
522-5 
29-6" and under 
56-5 
323 
478-5 
858-0 
Total 
1287-5 
1010 
624-5 
2922 
= 
r.t = 
»p = 
>V = 
Ik. 
•789 
•7504 ± -0210 
•7864 ± -0077 
•7745 ± •0151 
•7877 ± -0078 
= -7858 ± ^0077 
= ^8770 
Mean Individual 
dispersion dispersion 
•7857 -7116 
•7812 -6951 
r-,, = 
•780 ± 
•787 ± 
•795 ± 
•785 ± 
■010 
■oil 
■012 
•Oil 
A. P.E. 
(•010) 
(•oil) 
(•oil) 
(•012) 
Mean 
dispersion 
-7962 
•8065 
Individual 
dispersion 
•7417 
-6841 
Afpendix. 
Probable errors of r^, r,„, Vj,. 
P.E. of 
P.E. of 
P.E. of 
arithmetic 
weighted 
polychoric r 
mean (r,„) 
mean (r,,,) 
(rp) 
A 
•0246 
-0211 
-0209 
B 
-0254 
-0253 
-0250 
C 
-0253 
-0311 
-0241 
D 
-0239 
•0236 
■0235 
E 
-0327 
•0247 
-0245 
P 
•0101 
-0101 
-0101 
G 
-0111 
•0112 
-0108 
H 
-0108 
-0107 
-0107 
K 
•0249 
-0247 
-0246 
L 
•0326 
-0285 
•0282 
M 
-0078 
•0077 
-0077 
My thanks are due to Professor Pearson, who suggested the enquiry, for his 
ever ready help and advice throughout the work. I have also to thank Miss Alison 
Robertson for assistance in reading the proofs. 
