308 



PROFESSOR K. PEARSON AND MR. L. N. G. FILON 



Now it is clear that although the curve is nearly normal, there is still sensible 

 correlation between quantities e.g., mean and cr or d which would have no cor- 

 relation between them if the curve were absolutely normal. This will be clearer if, 

 as in the previous illustration, we replace this table by a table of regression 

 coefficients. 



This table has now finally to be thrown into more suitable units and attention 

 paid to the fact that TO increases towards divarfs. We have, after the proper changes, 



the following results :- 



PROGRESSION Table. 



This table is extremely suggestive. It shows us that a random selection of girls 

 of eight which had an increase of stature would have a less standard deviation, less 

 distance between the mode and mean and less skewness. In other words, a selection 

 giving taller children would be less variable and more nearly normal. Now as 

 children grow older their stature increases, is less variable, and is more normal in its 

 distribution. Thus, a selection of taller children from among children of eight 

 would broadly tend to reproduce the characters of the stature distribution of older 



