Egon S. Pearson 
81 
a little too low, and as a test of the amount of cumulative error which may be 
affecting Rjg', I have worked out this constant directly from the relations 
EXPERIMLNT C. 10 Second Counting, correlation- interval Diagram. 
3 4 5 6 7 8 9 10 tl 12 13 
Interval between successive judgments 
Fig. 17. 
with the following results : 
Ri3' = - -0124 + -0213, Zi3 = + -632* 
»SV = -03426, S,: = -03444. 
Rij' and presumably Rj/ are not therefore significantly negative, and it seems 
probable that R^.' tends to zero as k increases, without oscillating about that value. 
The points {h, R^) and {k, R^') are plotted in Figure 17 ; the theoretical curve 
drawn in the diagram will be referred to in Section XI. 
1/^., or the limit to which R^. approaches as Kj.' tends to zero is discussed on p. 34. 
Biometrika xiv c 
