p. F. EVERITT 
441 
Case III. More than three columns or rows. 
Find the vahie of as many of the corner divisions as may be treated as the 
d of a fourfold table by the method of Case I ; then find the column and row 
totals, if not already known, and from them the values of other divisions and 
groups of divisions. The table is then divided afresh and the values of other 
groups of divisions obtained and this process repeated until the values of the 
remaining separate divisions may be found by differences. This case is really an 
extension of Case II. 
In conclusion I desire to express my indebtedness to Prof. Pearson for 
suggesting the construction of the tables and for much valuable advice as to 
methods of calculation and arrangement. I also wish to express my thanks to 
Mr Sheppard for allowing me to use a hitherto unpublished table of the 
probability integral, from which the values of h corresponding to given values of 
^(1— a) have been taken, the published tables not providing sufficient decimal 
places without troublesome interpolation. 
Auxiliary Table for calculating Tetrachoric Functions 
beyond those Tabled. 
n 
Pn 
'In 
7 
•37796 
8 
•35355 
•80178 
9 
•33333 
•82496 
10 
•31623 
•84327 
11 
•30151 
•85812 
12 
■28868 
•87039 
