Dear Statalisters,
I have repeated cross section survey data from different countries. I want to estimate how the (staggered) abolition of one law has impacted the outcome of interest. In my setting, the law was based on year of birth cohort, thus in the same country we have individuals that were subject to it (not treated) and individuals not subject to it anymore (treated). In addition to countries that abolished this particular law, I also have a sample of countries that never abolished it, thus individuals are always not treated. My issue is the following: when using csdid (or csdid2) from ssc the command seems not to recognize the never treated group (set as zero) and perform the regression only on not-yet treated groups. Any idea why?
Please see attached example. The variable cohort is my gvar and varies by country.
Code:
I have repeated cross section survey data from different countries. I want to estimate how the (staggered) abolition of one law has impacted the outcome of interest. In my setting, the law was based on year of birth cohort, thus in the same country we have individuals that were subject to it (not treated) and individuals not subject to it anymore (treated). In addition to countries that abolished this particular law, I also have a sample of countries that never abolished it, thus individuals are always not treated. My issue is the following: when using csdid (or csdid2) from ssc the command seems not to recognize the never treated group (set as zero) and perform the regression only on not-yet treated groups. Any idea why?
Please see attached example. The variable cohort is my gvar and varies by country.
Code:
Code:
tab yrbrn cohort if inrange(yrbrn,1970,1975)
Year of | cohort
birth | 0 1942 1948 1976 | Total
-----------+--------------------------------------------+----------
1970 | 626 110 20 104 | 2,398
1971 | 562 109 10 87 | 2,214
1972 | 572 92 6 67 | 2,121
1973 | 492 78 6 90 | 2,041
1974 | 499 77 3 73 | 2,049
1975 | 471 70 7 64 | 1,977
-----------+--------------------------------------------+----------
Total | 3,222 536 52 485 | 12,800
csdid AvgIndex, time(yrbrn) gvar(cohort) long2 cluster(country_wave)
No never treated observations found. Using Not yet treated data
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