VII.] 



DISCUSSION OF THE DATA OF STATURE. 



129 



four brothers, and therefore giving an increased weight 

 to those Fraternities, but in other respects the system 

 was hardly objectionable. The introduced error must 

 be so slight as to make it scarcely worth while now to 

 go over the work again. By the system adopted, I 

 found the Prob. Difference to be 1"55, which divided 

 by v / 2 gives b =1'10 inch. 



Thus far we have dealt with the special data only. 

 The less trustworthy R.F.F. give larger values of b in 

 every case. An epitome of all the results appears in 

 the following table :— 



Methods and data. 



Values of 6 obtained by different methods 

 and from different data. 



From Special Data. 



From E.F.F. data.i 



(1) From Fraternities each 

 containing the same number of 

 persons 



1-07 

 0-98 

 MO 

 MO 



1-06 



U38 

 1-31 

 M4 

 1-35 



(2) From the mean value of 

 Fraternal Regression 



(3) From the Variability of 

 Fraternal Regression 



(4) From Pairs of Rrothers 

 taken at random 



Mean 



The data used in the four methods are somewhat 

 different. In (1) I could not deal with small Fraterni- 



1 The R.F.F. results were obtained from brothers only and not from 

 transmuted sisters, except in method (2), where the paucity of the data 

 compelled me to include them. 



K 



