Ermisch, John F; Wright, Robert E - C.E.P.R. Discussion Papers - 1988
1980 Women in Employment Survey) finds significant sample selection bias for women in full-time jobs. Part of the observed … differential between the hourly pay of full-timers and part-timers arises because of self-selection of women who can command higher … remunerated at a lower rate in part-time than in full-time employment. Thus, the larger proportion of women than men in part …