csdid pannel resulting in all ommisions

[Ashley Falls]

Hello all!

I am working through a staggered did model where I am looking at the impact of policy implementation (VarA) on total real dollars (VarB) in a panel dataset. When I try to run csdid everything is being committed.

So far, here is what I have tried:

csdid totaldollars, ivar(state) time(year) gvar(treatmentyear) method(dripw)

I first tired adjusting my variable based on inflation-generating adjtotaldollars but the results were the same. I also did log of the variable and std(totaldollars) but all resulted in the same.

Here is the xtreg results:

Any help or ideas would be greatly appreciated!

[FernandoRios]

Start with something simple
Do
tab year gvar
thanks
also make sure you have drdid installed

[Ashley Falls]

Here are the results. I double checked and I have drdid installed

[FernandoRios]

Ok that is your error
except for 1 or 2 cohorts
you are not observing treated cohorts before treatment
for example the gvar2004 is zero before 2004

[Ashley Falls]

Ok that makes sense, so for this to work the gvar value should be applied for years before treatment? For example, for a particular data set, they started the policy in 2004, and currently, I have all years before 2004 as zero for this data set. It should be 2004 for all years if they implemented the policy?

[FernandoRios]

Exactly,
Gvar tells you when a unit would be treated (present past or future) not IF it was treated.
So if unit 1 is treated in 2004, gvar=2004 at time 2000 , 2004 or 2020.

Hope this helps
F

[Ashley Falls]

Thank you! That worked great!!