{"kind":"user","text":"Angrist and Evans (1998), 'Children and Their Parents' Labor Supply', Table 6, column (4): in the 1980 Census sample of married women aged 21-35 with two or more children, regress by ordinary least squares the indicator that the mother has more than 2 children on the indicator that her first two children are of the same sex, with an intercept and no other covariates. Report the coefficient on the same-sex indicator."}