278 
On Theories of Association 
Diagram XXI. Diagram showing variations of various coefficients for fourfold tables with diagonal 
dichotomies in the case of Ages at Marriage of Husband and Wife. 
LO 
•6 
to -5 
•4- 
1- 
-I r- 
20 25 30 35 40 45 50 55 60 65 70 75 80 85 
Age Division in Grouping. 
