Effect of Family Size on Whether Children Finished 12 Years of Schooling Instrumental Variable Estimation
| OLS (No Controls) | OLS (Controls) | First Stage | Second Stage | N | |
|---|---|---|---|---|---|
| Instrument: twin at second birth (Sample: first child in families with two or more births) | 0.726* (0.021) | 150706 | |||
| Number of children in family | −0.030* (0.001) | −0.013* (0.001) | −0.029 (0.015) | ||
| Instrument: twin at third birth (Sample: First and second children in families with three or more births) | 0.847* (0.020) | 113475 | |||
| Number of children in family | −0.034* (0.002) | −0.016* (0.002) | −0.039* (0.015) | ||
| Instrument: twin at fourth birth (Sample: first, second, and third children in families with four or more births) | 0.900* (0.040) | 36927 | |||
| Number of children in family | −0.016* (0.003) | −0.007 (0.003) | −0.040 (0.025) | ||
| Instrument: first two children same sex (Sample: First two children in families with two or more births) | 0.081* (0.003) | 260236 | |||
| Number of children in family | −0.028* (0.001) | −0.012* (0.001) | −0.019 (0.021) | ||
| Instrument: first three children same sex (Sample: first, second, and third children in families with three or more births and first two births are same sex) | 0.069* (0.005) | 77410 | |||
| Number of children in family | −0.028* (0.001) | −0.014* (0.002) | 0.023 (0.049) |
↵* indicates statistical significance at the 5 percent level. Standard errors (in parentheses) allow for correlation of errors within family. N represents number of individuals. The regressions also include indicators for age, test year, mother’s age, mother’s age at first birth, mother’s education, father’s education, father’s IQ, and the log birth weight of the children studied. Children are aged at least 21 in 2002.