A statistical analysis of the effect of warfare on the human secondary sex ratio.

摘要: Many factors have been hypothesized to affect the human secondary sex ratio (the annual percentage of males among all live births), them race, parental ages, and birth order. Some authors even proposed warfare as a factor influencing ratios. The hypothesis that during shortly after periods war is higher has received little statistical treatment. In this paper we evaluate using 3 methods: linear regression, randomization, time-series analysis. Live data from 10 different countries were included. Although cannot speak general phenomenon, evidence for an association between was found several countries. Regression randomization test results in agreement. Time-series analysis showed most sex-ratio time series can be described by common model. obtained intervention models differed somewhat regression methods.