H. E. SOPER 
389 
i(l-a) 
(pa 
*(!-«) 
fa 
•50 
•0354 
1 -5708 
2-5000 
■20 
-0871 
2-0414 
2-8578 
•49 
•0353 
r57ii 
2-5003 
■19 
-1001 
2-0898 
2-8951 
■J,8 
■0350 
1-5722 
2-5011 
■18 
•1146 
2-1437 
2-9364 
•47 
•0346 
1^5741 
2-5024 
■17 
-1308 
2-2035 
2-9825 
■46 
•0339 
1^5766 
2-5043 
■16 
-1490 
2-2703 
3-0341 
■45 
•0331 
1-5799 
2-5068 
■15 
-1696 
2-3453 
3-0923 
•44 
•0321 
1-5839 
2-5098 
'U 
-1931 
2 -4303 
3-1582 
■43 
•0309 
1-5886 
2^5134 
■13 
-2201 
2-5272 
3-2337 
■42 
•0295 
1-5943 
2-5177 
■12 
-2513 
2-6389 
3-3208 
•41 
•0279 
1 -6007 
2-5225 
•11 
-2880 
2-7687 
3-4224 
•40 
•0260 
1-6079 
2-5279 
■10 
-3317 
2-9221 
3-5427 
■39 
•0240 
1-6161 
2-5341 
■095 
•3568 
3-0095 
3-6115 
■38 
•0217 
1-6251 
2-5409 
■090 
•3844 
3-1057 
3-6873 
•37 
•0191 
1-6351 
2-5484 
■085 
-4153 
3-2119 
3-7713 
■36 
•0163 
1'6461 
2-5568 
■080 
-4499 
3-3299 
3-8648 
■3S 
•0132 
1 -6582 
2-5659 
■075 
-4887 
3-4620 
3-9696 
'SJf. 
•0098 
1-6714 
2-5759 
■070 
-5324 
3-6110 
4-0879 
■S3 
•0062 
1-6858 
2-5868 
■065 
- 
-5822 
3-7806 
4^2224 
■32 
•0021 
1-7015 
2-5986 
■060 
■6403 
3-9748 
4^3777 
•31 
- ^0023 
1-7186 
2-6115 
■055 
•7083 
4-2002 
4-5584 
•30 
- ^0070 
1-7371 
2-6256 
■050 
•7897 
4-4652 
4-7723 
■29 
-•0122 
1 -7573 
2-6409 
■045 
•8868 
4-7829 
5-0283 
■28 
- -0179 
1-7791 
2-6575 
■040 
1 ^0053 
5-1715 
5-3410 
•27 
- ^0241 
1-8028 
2-6755 
■035 
1^1577 
5-6568 
5-7362 
•26 
- ^0308 
1-8286 
2-6952 
•030 
1 -3556 
6-2859 
6-2485 
■25 
- ^0382 
1-8567 
2'7166 
•025 
r6308 
7-1347 
6-9481 
•24 
- -0462 
1-8874 
2-7399 
•020 
2-0272 
8-3600 
7-9572 
■23 
- ^0550 
1 -9208 
2-7654 
■015 
2-5263 
10-3024 
9-4275 
■22 
- ^0647 
1 -9574 
2-7933 
■010 
3-8889 
13-9393 
12-6086 
■21 
- -0753 
1-9974 
2-8240 
(24). 
The bi-serial value of the correlation coefficient has the standard deviation 
vyrhilst that of the product moment value is 
In table (25) a comparison of the values of the numerator is made for five 
values of r, for divisions at 0, '5, ...2"5 times the standard deviation from the mean 
of the ungraded character. 
Values of J{xa'-i^ar 
- + rJ) for 
i(l-«) = 
Values 
?• 
of 
(!-'■-) 
-500 
-309 
•159 
-067 
-023 
-000 
■00 
1-00 
1-25 
1-31 
1-51 
1-93 
2-76 
4-5 
-25 
-9375 
1-19 
1-25 
1-45 
1-86 
2-68 
4-3 
-50 
-750 
1-00 
1-06 
1'26 
1-65 
2-42 
4-0 
-75 
-4375 
-69 
■75 
-94 
1-30 
1-95 
3-2 
1-00 
-00 
-27 
-33 
-49 
-74 
1-13 
1-8 
Biometrika 
50 
