30 



CARL SCHIØTZ. 



M.-N. Kl. 



skew distribution of the weight curves, so that the extension toward the 

 plus-side is considerably larger than tozvard the minus-side. The conse- 

 quense of this is that the "type" of the year class does not coincide with 

 the arithmetical average of the year class, but lies lower than this (more 

 toward the left). The arithmetical average for weight is therefore not 

 a perfectly valid characteristical number-representative for the year class. 

 The strong plus-deviation removes the average perceivably toward the 

 plus-side, while the real type for the age (that number around which most 

 of the variants group themselves) is lower, more to the left on the curve. 

 The socalled "typical number" for the weight of every age is computed 

 after the directions in (j v n n a r Ja h n's Statistical handbook. It is 

 here quoted compared to the arithmetical average: 



Table 9. 

 Boys. 



Age 



8 years 



13 



14 



8 years 



9 » 



13 



14 



Average 



23-4 kg. 



25-3 » 



27.6 » 



29.9 » 



32.5 • 



35-1 » 



38.5 » 



Typical 

 number 



23.0 

 25.0 



27-5 

 29-5 

 3Ï-9 

 34-0 

 36.5 



Difference 



Absolute 



Girls. 



0.4 ki 



0.3 » 



O.I » 



0.4 >• 



0.6 » 



0.6 k§ 



I.I » 



1.3 » 



1.3 •• 



1.4 » 

 2.1 

 2.4 » 



in of the 

 average 



1-7 

 1.2 

 0.4 



1-3 

 1.8 



3-1 



2-7 



4-7 

 5-1 

 4-5 

 4.4 

 6.0 

 6.1 



It is seen from this comparison, tliat the most typical number- 

 representative distances itself perceivably, partly even very considerably, 

 from the aritJimetical average. This deserves to be emphasised, as it 

 never — as far as I know — has been investigated after this statistical 

 method, for the school age. (I have not either found anything corre- 

 sponding for the grown-up age, although I cannot deny that it possibly 

 has been investigated.) It must furthermore be specially stated, that 

 a few isolated individuals — with number valuations which are without 

 direct connection with the continuous 3 kilogram groups (cf. the curves) 

 — have not been included. These would have made the curves still more 

 skew by addition to the plus-side -^. 



But we would then surely — with this large material 

 pathological individuals mixed in. 



have got undoubtedly 



