I am using Callaway and Sant’Anna 2021 estimating the treatment effects of a staggered treatment on school enrollment.
I used the outcome regression method. I can get the estimates for all groups. However, when I use the double robust method (dripw), the estimates for group 1994 are omitted. I did the following checks.
Here is my code.
Here is the policy_time variable.
Here is my data.
Here are part of my results
I used the outcome regression method. I can get the estimates for all groups. However, when I use the double robust method (dripw), the estimates for group 1994 are omitted. I did the following checks.
- The covariates for g1994 are all missing: No, the missing situation is similar to other groups.
- The overlapping of the covariates is worse for g1994: It seems not the case too.
Here is my code.
Code:
use "$path\analysis\temp\data_reg_sample.dta",clear global cov_mix dist_rev_pupil dist_total_race dist_white city sub town schl_total_race schl_white csdid total_race $cov_mix if sample_exist_allyears==1&flag_gap==0&flag_state==0, ivar(schlid) time(year) gvar(policy_time) method(dripw) estat event, estore(cs)
Code:
policy_time | Freq. Percent Cum.
------------+-----------------------------------
0 | 726,245 48.64 48.64
1992 | 44,733 3.00 51.64
1993 | 27,118 1.82 53.46
1994 | 135,837 9.10 62.55
1996 | 78,182 5.24 67.79
1997 | 37,739 2.53 70.32
1998 | 46,189 3.09 73.41
1999 | 208,806 13.99 87.40
2000 | 169,442 11.35 98.75
2001 | 18,733 1.25 100.00
------------+-----------------------------------
Total | 1,493,024 100.00
Code:
* Example generated by -dataex-. For more info, type help dataex clear input float schlid int(year policy_time) float total_race long dist_rev_pupil float dist_total_race long dist_white float(city sub town schl_total_race) int schl_white 1 1990 1996 . . 439 150 1 0 0 . . 1 1991 1996 . . 439 150 1 0 0 . . 1 1992 1996 . . 439 150 1 0 0 . . 1 1993 1996 . . 439 150 1 0 0 . . 1 1994 1996 . . 439 150 1 0 0 . . 1 1995 1996 123 . 439 150 1 0 0 . . 1 1996 1996 127 . 439 150 1 0 0 . . 1 1997 1996 . . 439 150 1 0 0 . . 1 1998 1996 . . 439 150 1 0 0 . . 1 1999 1996 . . 439 150 1 0 0 . . 1 2000 1996 . . 439 150 1 0 0 . . 1 2001 1996 . . 439 150 1 0 0 . . 1 2002 1996 . . 439 150 1 0 0 . . 2 1990 1996 . . 439 150 1 0 0 . . 2 1991 1996 . . 439 150 1 0 0 . . 2 1992 1996 . . 439 150 1 0 0 . . 2 1993 1996 . . 439 150 1 0 0 . . 2 1994 1996 . . 439 150 1 0 0 . . 2 1995 1996 . . 439 150 1 0 0 . . 2 1996 1996 . . 439 150 1 0 0 . . 2 1997 1996 . . 439 150 1 0 0 . . 2 1998 1996 . . 439 150 1 0 0 . . 2 1999 1996 . . 439 150 1 0 0 . . 2 2000 1996 . . 439 150 1 0 0 . . 2 2001 1996 . . 439 150 1 0 0 . . 2 2002 1996 . . 439 150 1 0 0 . . 3 1990 1996 . . 439 150 1 0 0 . . 3 1991 1996 . . 439 150 1 0 0 . . 3 1992 1996 . . 439 150 1 0 0 . . 3 1993 1996 . . 439 150 1 0 0 . . 3 1994 1996 . . 439 150 1 0 0 . . 3 1995 1996 . . 439 150 1 0 0 . . 3 1996 1996 . . 439 150 1 0 0 . . 3 1997 1996 . . 439 150 1 0 0 . . 3 1998 1996 . . 439 150 1 0 0 . . 3 1999 1996 . . 439 150 1 0 0 . . 3 2000 1996 . . 439 150 1 0 0 . . 3 2001 1996 . . 439 150 1 0 0 . . 3 2002 1996 . . 439 150 1 0 0 . . 4 1990 1996 . . 439 150 1 0 0 . . 4 1991 1996 . . 439 150 1 0 0 . . 4 1992 1996 . . 439 150 1 0 0 . . 4 1993 1996 . . 439 150 1 0 0 . . 4 1994 1996 . . 439 150 1 0 0 . . 4 1995 1996 . . 439 150 1 0 0 . . 4 1996 1996 . . 439 150 1 0 0 . . 4 1997 1996 . . 439 150 1 0 0 . . 4 1998 1996 . . 439 150 1 0 0 . . 4 1999 1996 . . 439 150 1 0 0 . . 4 2000 1996 . . 439 150 1 0 0 . . 4 2001 1996 . . 439 150 1 0 0 . . 4 2002 1996 . . 439 150 1 0 0 . . 5 1990 1996 115 . 439 150 1 0 0 115 53 5 1991 1996 104 . 439 150 1 0 0 115 53 5 1992 1996 . . 439 150 1 0 0 115 53 5 1993 1996 . . 439 150 1 0 0 115 53 5 1994 1996 . . 439 150 1 0 0 115 53 5 1995 1996 . . 439 150 1 0 0 115 53 5 1996 1996 . . 439 150 1 0 0 115 53 5 1997 1996 . . 439 150 1 0 0 115 53 5 1998 1996 . . 439 150 1 0 0 115 53 5 1999 1996 . . 439 150 1 0 0 115 53 5 2000 1996 . . 439 150 1 0 0 115 53 5 2001 1996 . . 439 150 1 0 0 115 53 5 2002 1996 . . 439 150 1 0 0 115 53 6 1990 1996 205 . 439 150 1 0 0 205 68 6 1991 1996 196 . 439 150 1 0 0 205 68 6 1992 1996 224 . 439 150 1 0 0 205 68 6 1993 1996 255 . 439 150 1 0 0 205 68 6 1994 1996 260 . 439 150 1 0 0 205 68 6 1995 1996 258 . 439 150 1 0 0 205 68 6 1996 1996 328 . 439 150 1 0 0 205 68 6 1997 1996 . . 439 150 1 0 0 205 68 6 1998 1996 . . 439 150 1 0 0 205 68 6 1999 1996 . . 439 150 1 0 0 205 68 6 2000 1996 . . 439 150 1 0 0 205 68 6 2001 1996 624 . 439 150 1 0 0 205 68 6 2002 1996 . . 439 150 1 0 0 205 68 7 1990 1996 119 . 439 150 1 0 0 119 29 7 1991 1996 126 . 439 150 1 0 0 119 29 7 1992 1996 231 . 439 150 1 0 0 119 29 7 1993 1996 228 . 439 150 1 0 0 119 29 7 1994 1996 127 . 439 150 1 0 0 119 29 7 1995 1996 128 . 439 150 1 0 0 119 29 7 1996 1996 138 . 439 150 1 0 0 119 29 7 1997 1996 . . 439 150 1 0 0 119 29 7 1998 1996 . . 439 150 1 0 0 119 29 7 1999 1996 . . 439 150 1 0 0 119 29 7 2000 1996 . . 439 150 1 0 0 119 29 7 2001 1996 . . 439 150 1 0 0 119 29 7 2002 1996 . . 439 150 1 0 0 119 29 8 1990 1996 . . 439 150 1 0 0 . . 8 1991 1996 . . 439 150 1 0 0 . . 8 1992 1996 . . 439 150 1 0 0 . . 8 1993 1996 . . 439 150 1 0 0 . . 8 1994 1996 . . 439 150 1 0 0 . . 8 1995 1996 . . 439 150 1 0 0 . . 8 1996 1996 . . 439 150 1 0 0 . . 8 1997 1996 . . 439 150 1 0 0 . . 8 1998 1996 . . 439 150 1 0 0 . . end
Here are part of my results
Code:
g1994 | t_1990_1991 | 0 (omitted) t_1991_1992 | 0 (omitted) t_1992_1993 | 0 (omitted) t_1993_1994 | 0 (omitted) t_1993_1995 | 0 (omitted) t_1993_1996 | 0 (omitted) t_1993_1997 | 0 (omitted) t_1993_1998 | 0 (omitted) t_1993_1999 | 0 (omitted) t_1993_2000 | 0 (omitted) t_1993_2001 | 0 (omitted) t_1993_2002 | 0 (omitted) -------------+---------------------------------------------------------------- g1996 | t_1990_1991 | -1.677059 1.28799 -1.30 0.193 -4.201473 .8473537 t_1991_1992 | -.0237585 1.247963 -0.02 0.985 -2.469721 2.422204 t_1992_1993 | .3585908 1.332869 0.27 0.788 -2.253785 2.970967 t_1993_1994 | 3.328838 1.225954 2.72 0.007 .9260135 5.731663 t_1994_1995 | .9417342 1.151133 0.82 0.413 -1.314445 3.197914 t_1995_1996 | .0195993 1.584956 0.01 0.990 -3.086857 3.126055 t_1995_1997 | -1.333024 1.964771 -0.68 0.497 -5.183904 2.517857 t_1995_1998 | -.6728093 2.307083 -0.29 0.771 -5.194609 3.848991 t_1995_1999 | 4.063073 2.714508 1.50 0.134 -1.257266 9.383412 t_1995_2000 | 5.373174 2.984525 1.80 0.072 -.4763882 11.22274 t_1995_2001 | 5.737148 3.264699 1.76 0.079 -.6615453 12.13584 t_1995_2002 | 2.819582 3.49881 0.81 0.420 -4.03796 9.677124 -------------+---------------------------------------------------------------- g1997 | t_1990_1991 | -6.304111 3.434251 -1.84 0.066 -13.03512 .4268978 t_1991_1992 | -3.871075 2.257694 -1.71 0.086 -8.296073 .5539239 t_1992_1993 | -6.056548 5.125531 -1.18 0.237 -16.1024 3.989307 t_1993_1994 | .6657653 2.421522 0.27 0.783 -4.08033 5.411861 t_1994_1995 | 9.628556 2.580237 3.73 0.000 4.571384 14.68573 t_1995_1996 | 8.05734 2.149519 3.75 0.000 3.84436 12.27032 t_1996_1997 | 1.352238 5.222472 0.26 0.796 -8.883618 11.58809 t_1996_1998 | 8.04696 6.274062 1.28 0.200 -4.249976 20.3439 t_1996_1999 | 12.79983 11.83289 1.08 0.279 -10.39221 35.99187 t_1996_2000 | 11.29332 14.7753 0.76 0.445 -17.66574 40.25239 t_1996_2001 | 5.736991 22.44627 0.26 0.798 -38.25689 49.73087 t_1996_2002 | -.3827442 27.14797 -0.01 0.989 -53.59179 52.8263
Comment