Egon S. Pearson 
73 
(c) Comparison with Experiment A. 
The difference between the results of the two experiments is probably due 
to the fact that the estimation of a half is so much easier than the estimation of 
a third. The variations in the latter observations are all on a larger scale than 
in the former ; the secular and sessional changes are very much greater, and if we 
compare the values of the fundamental constants, we find : 
Si Sg Ri' 
Trisection -0845 -0732 + -6246 ± -0130 
Bisection '0436 '0495 + -3519 ± -0187 
Experiment B. Bisection. Correlation - interval diagram. 
4 5 6 7 8 9 10 
Interval between successive judgments 
FiK. 12. 
and even after the removal of the greater part of the sessional change — (the best 
fitting straight lines)— the coefficient R/' for the Trisections is + -4892, or greater 
than Ri' for the Bisections. The ratio of the values of S&, or roughly 3 to 2, is a 
