SECTION VIII. NOTE ON CORRELATION BETWEEN 



AGE AND STATURE. 



I shall give a short summary of the values of the Coefficient 

 of Correlation between Age and Stature, reserving a fuller discus- 

 sion for a future part. 



{a) The whole scries {all ages), total= 191. 



The age has been recorded in the case of 191 out of the total 

 group of 200 which we have been considering so far. I have used 

 the standard " product moment " method.' 



I find for stature, with 50 mm. unit of grouping and 1660 mm. 

 base number, 



*,'=- '14136, and 



Thus Mean Stature = 1656-14 mm. 



S.D.= a x - 654923 mm. 



For age, with one year unit of grouping and base number = 24 

 years, 



'','=+•27 

 and i'/ = 44-98. 



Thus Mean Age =2427 years 



S.D. = <r, = 67022 years. 



With the same units and base numbers we find the product 

 moment to be +40* 2670. 



Correcting for base number, we have 



i* l 1 = Product moment = +40-22 



MM 4022 



ihus r— + 



67022 x 65-4923 



= + -1089 



The Probable Error is given by '6745 (1 -r' l )/^/n 



N = igi, hence P.E. is= ±'049. 



We have then 



r- + -1089 + -o4' 



The correlation coefficient is slightly over twice its Probable 

 , hence it is not definitely significant. In any case the correla- 

 tion between age and stature stems to be small. 



The low averag of the whole sample shows the presence 



of a considerable number of individuals in their early youth. I 

 next separated the measurements of those above 25 years of age 



Yule, Statistics Chap. IX. 

 K.nl Pearson: Rej on, Heredit) and Panminia " Phil. Trans. 



Vol. 187A, 1896 



