﻿Harris: Distribution and correlation of 



For A. vulgare it seems desirable to calculate regression on the 

 grouped values given in Table II, This gives for the correlation 



value differing from that obtained from the ungrouped obser- 

 ations by only about one tenth its probable error. The regression 



5 = 27.065 + 1.274^, 



p = .5280+ .15185. 



These are the lines in the diagram, Fig. i. 



- — 



=1 



— 



— ° 



~ 



.„-!_. 



/ 



Hb^ 













°X/ 



i------ 



„ I 











'' 



I 

























'f^^^i^ 



1 -- 



^ 









V 











■■^-i 



— 



, ^ 



3 a 



/ 



/ 



3 3S 4 



L_ 





number of staminate 



These diagrams show considerable irregularities in the dis- 

 tribution of the means of the numbers of pistillate flowers asso- 

 ciated with different numbers of staminate flowers and vice versa. 

 It seems desirable, therefore, to apply a statistical test of the good- 

 ness of fit of the straight lines to the empirical means. Calculating 



