•258 
On Corrections for Moment-Coefficients 
1st Method of this paper 
Raw moments 
Male 
Female 
Male 
Female 
Mean 
•609 
■610 
•592 
•592 
Standard Deviation 
2-73 
2-82 
2^72 
2-81 
The means are inadequate, but it is remarkable how close the standard deviations 
are to the corrected values. 
(14) The reader may occasionally be puzzled to settle whether a frequency 
distribution has really a finite or infinite initial ordinate and therefore be in doubt 
as to whether he should apply the first or second method of this paper. Our 
Illustration III may be taken as a possible example of this, although the ex- 
aggeration of the first frequency is nothing like so marked as in the case of con- 
genital malformations. 
If we apply the first equation of (xxxi) to the first three days' period we find : 
0—3 days = 18-25 
0-58 whence 18-25/^/" = - 14-057,688 
7-89 V 01" At," = - '77, 
5-65 remembering our three days' unit, 
5-82 } Mean = '69 day. 
3—6 
6—9 „ «, 
9—12 „ n, 
12—15 „ n, 
Our table now becomes : 
0— 3 days 18-25 centred at -69 days 
3—6 „ 6-58 4-5 
6—9 „ 7'89 7-5 
9—12 „ 5^65 10-5 
12—15 „ 5-82 13-5 
15—1 months 19-80 ^75 months 
1— 2 „ 22-59 1-5 
2— 3 „ 18-58 2^5 
3— 4 „ 15-96 3-5 
4— 5 „ 13-30 4-5 
5— 6 „ 11-51 5-5 
6— 7 „ 10-61 6-5 
7— 8 „ 9-30 7-5 
8— 9 „ 8-74 8^5 
9— 10 „ 8-29 9-5 
10— 11 „ 7-51 10-5 
11— 12 „ 6-94 11-5 „ 
Total 197-32 
Hence by raw moments we find : 
Mean = 112-98 days as against 114-61 days, 
Standard Deviation = 105-53 „ „ 107-15 „ 
found by the first method of this paper. 
Here we have not used our full second method but the results are in fairly close 
accord, especially in view of the fact that we have not corrected for the curtailment 
abruptly at the end of the 12 months. Accordingly the suggestion made is that 
in doubtful cases both methods will give fairly closely the same values, and therefore 
we need not worry over which is the more correct one to apply. 
