The design is a multicenter, two-armed, randomized trial with 37,000 females and 37,000 males in each of the two arms.
The males in each community are related to one another because they spend their lives where they were born, whereas the females usually migrate to neighboring communities soon after reaching puberty, a practice that avoids inbreeding.
When direct conflict occurred between conspecific baboon groups, the winning group was predicted by differences in the number of adult males in each group and/or groups that had used the areas surrounding the encounter location more intensively than their opponent in the preceding 9 or 12 months.
Then, they let females choose between the males in each group.
The trend line of number of sexual violence victims decreased across the years, with children composing the majority of sexual violence victims and females outnumbering males in each of the study years (Fig. 1).
The beetles were not sexed at this stage but eggs were laid in each case, which indicated that either females were already mated or there were sufficient males in each group of 20 to mate with the females.
There were no significant differences between the patient and control groups with respect to age (42.2 ± 11.92 vs. 43.2 ± 16.23; t = 0.18, p = 0.85) or sex (27 females, 23 males in each group).
(Imagine for the moment a hypothetical situation in which there is a given number of young adult females but an unlimited number of males in each population, so that any proportionate distribution of mothers according to the population of fathers is possible and reflective only of preferences).
Thus, for example, the change in the wage for rural educated males relative to rural uneducated males is computed as a weighted average of the corresponding mean wage changes for old and young rural males in each of these educational categories.
There are generally more females than males in each single year of age, except for the youngest ages 0-188) and late 30's and late 50's.
Robert Hartwell and Robert P. Hymes criticized this model, stating that it places too much emphasis on the role of the nuclear family and demonstrates only three paternal ascendants of exam candidates while ignoring the demographic reality of Song China, the significant proportion of males in each generation that had no surviving sons, and the role of the extended family.
