THE STATISTICAL STUDY OF VARIATION 51 
2 3 4 5 6 a 
0-1 3 3 
1-2] 28 19 3 50 
2-3| 18 66 20 1 1 |106 
3-4 1 42 58 7 1 109 
4-5 7 59 11 3 80 
5-6 26 14 2 42 
6-7 1 3 7 
7-8 1 i 2 
8-9 1 1 
50 134 167 38 10 1 400 
Fie. 22.—Correlation table for 400 plants of Sixty Day oats. Total yield of plant 
in grams, subject. Number of culms per plant, relative. 1910. Coefficient of correla- 
tion = 0.712 + 0.017. (From Love and Leighty, 1914.) 
2 3 4 5 6 7 
45-50 1 1 2 
50-55 2 3 3 1 9 
55-60 4 9 4 2 2 21 
60-65 6 10 13 4 1 34 
65-70 8 40 42 6 1 97 
70-75) 15 41 53 12 2 123 
75-80] 10 22 43 11 3 89 
80-85 4 8 8 3 1 24 
85-90 0 
90-95 1 1 
50 134 167 38 10 1 400 
Fic. 23.—Correlation table for 400 plants of Sixty Day oats. Average height of plant 
in centimeters, subject. Number of culms per plant, relative. 1910. Coefficient of 
correlation = 0,042 + 0.034. (From Love and Leighty, 1914.) 
V,—M, = —d, V,—-M,=d, 
oe = > x 
V, — M, = -d, (—dz)(— dy) =drdy | (dz)(— dy) = — drdy 
(2) | (3) 
| My 
(1) (4G 
Vy = M, — dy (—dz) (dy) =. —d,dy (dz) (dy) = dzdy 
y M, 
Fie. 24.—Interpretation of the correlation tabbe. 
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