From: The effect of children on female labor force participation in urban Iran
 | 1 + sample | 2 + sample | 3 + sample | |||
---|---|---|---|---|---|---|
 | OLS | 2SLS | OLS | 2SLS | OLS | 2SLS |
First-stage results: fertility equation | ||||||
A firstborn son |  | −0.106*** |  |  |  |  |
 |  | (0.009) |  |  |  |  |
Two daughters | Â | Â | Â | 0.042*** | Â | Â |
 |  |  |  | (0.004) |  |  |
Two or more sons |  |  |  |  |  | −0.044*** |
 |  |  |  |  |  | (0.005) |
Estimation results: FLFP equation | ||||||
Number of children | −0.008*** | 0.005 |  |  |  |  |
 | (0.001) | (0.026) |  |  |  |  |
More than 2 children |  |  | −0.011*** | −0.033 |  |  |
 |  |  | (0.004) | (0.060) |  |  |
More than 3 children |  |  |  |  | −0.009** | −0.019 |
 |  |  |  |  | (0.004) | (0.068) |
Observations | 56,845 | 56,845 | 43,868 | 43,868 | 25,399 | 25,399 |
1st stage R-squared | Â | 0.562 | Â | 0.344 | Â | 0.226 |
2nd stage R-squared | 0.183 | 0.183 | 0.152 | 0.151 | 0.084 | 0.083 |
IV F-statistics | Â | 149.253 | Â | 149.430 | Â | 89.917 |