Z:gnu-www-ja-frank--5ef14c-Consistent with a variety of o/en

Consistent with a variety of other findings on sex differences in cooperation, we estimate that, other factors the same, the probability of a male defecting is almost 0.24 higher than the corresponding probability for a female. Even after controlling for the influence of gender, we see that the probability of an economics major defecting is almost 0.17 higher than the corresponding probability for a nonmajor.