RDIV Estimates of the Effects of Public Enrollment on Maternal Labor Supply, Single Mothers of Five-year-olds in 2000, Various Sample Widths
| 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|
| With No Younger Children | |||||
| Current employment | 0.122 | 0.153 | 0.192 | 0.158 | −0.092 |
| (0.048) | (0.054) | (0.091) | (0.111) | (0.186) | |
| Employment in prior year | 0.055 | 0.092 | 0.017 | 0.070 | 0.110 |
| (0.035) | (0.040) | (0.056) | (0.060) | (0.074) | |
| Weeks worked in prior year | 2.65 | 2.37 | −2.54 | −5.66 | −7.66 |
| (1.98) | (2.41) | (3.51) | (4.04) | (4.17) | |
| Usual hours per week in prior year | 3.01 | 3.43 | 0.89 | 1.23 | 9.14 |
| (1.64) | (2.01) | (3.03) | (3.67) | (5.29) | |
| Wage and salary income, prior year | 278 | 561 | 393 | 965 | 3520 |
| (2,807) | (3,160) | (4,449) | (5,547) | (8,697) | |
| Welfare receipt in prior year | 0.003 | −0.029 | 0.015 | 0.031 | 0.047 |
| (0.036) | (0.047) | (0.076) | (0.090) | (0.147) | |
| First stage estimate | 0.232 | 0.226 | 0.202 | 0.223 | 0.209 |
| (0.007) | (0.012) | (0.016) | (0.022) | (0.021) | |
| F−statistic | 974 | 365 | 152 | 103 | 97 |
| Number of observations | 43,199 | 23,625 | 12,068 | 7,282 | 2,536 |
| With Younger Children | |||||
| Current employment | 0.002 | 0.047 | 0.172 | 0.359 | 0.513 |
| (0.072) | (0.077) | (0.108) | (0.127) | (0.199) | |
| Employment in prior year | −0.035 | −0.007 | −0.027 | 0.158 | 0.267 |
| (0.062) | (0.076) | (0.122) | (0.146) | (0.250) | |
| Weeks worked in prior year | −1.10 | 0.49 | −3.95 | 4.86 | 6.24 |
| (3.08) | (3.20) | (4.80) | (5.44) | (9.55) | |
| Usual hours per week in prior year | −2.14 | −0.21 | 3.55 | 13.58 | 12.51 |
| (2.65) | (3.21) | (5.08) | (6.18) | (9.13) | |
| Wage and salary income, prior year | 1,467 | 2,974 | 5,380 | 6,354 | 3,240 |
| (2,616) | (2,797) | (4,008) | (4,550) | (6,163) | |
| Welfare receipt in prior year | −0.019 | −0.027 | 0.002 | 0.058 | 0.186 |
| (0.065) | (0.077) | (0.122) | (0.126) | (0.175) | |
| First stage estimate | 0.208 | 0.220 | 0.193 | 0.197 | 0.186 |
| (0.010) | (0.016) | (0.023) | (0.030) | (0.052) | |
| F−statistic | 452 | 180 | 68 | 43 | 12 |
| Number of observations | 23,066 | 12,638 | 6,651 | 4,007 | 1,382 |
| Width of Sample In Days | Full | 100 | 50 | 30 | 10 |
Notes: Based on the author’s calculations using the 2000 Restricted Access Long Form Data. Standard errors are in parentheses. Mothers in each sample are those born within the number of days indicated in the last row. Both stages include a linear polynomial in the child’s age relative to the cutoff data interacted with the cutoff date. Regressions include state fixed effects and the set of controls described in the text. Numbers in bold are significant at the 5 percent level or lower. F−statistics test the null in which the eligibility for public kindergarten has no effect on public kindergarten enrollment.