A Statistical Inquiry Into the Probability of Causes of the Production of Sex in
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1 11. 4 13. 2 7. 6 Total. .. IS 35, 345 L619 4. 6 INFLUENCE OF THE, \(JE OF THE I'AKENTS 25 It will be seen thai the cm-i— of male births in the general average markedly exceeds its normal value. We musl regard this divergence aE unreal and attribute it to the greater liability of a female child to be omitted from the record. As this omission would be probably about equal in the case of all the successive children, w may assume that the values of E m are all equally in error from this cause. Th...e normal value from the statistics of birth being about 2. 4, while the count gives !. «'. , we subtract the excess, 2. 2, from each separate value of E m and thus obtain corrected values of the percentage of excess, which are found in the last column. It will be seen from the numbers of this column that the excess of males among first-born children exceeds G per cent. This shows that there are about eight males to seven females of this class. But, in the case of the second child, the percentage of excess drops to 2.
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