Heterogeneous treatment effect D:time in formula

[yahoochen97]

Hi,

I am trying to replicate the simulation study in your paper that has linearly growing effect which is heterogereous. However, when I included time-treatment interaction in the model formula:

fit <- interFE(y ~ 1 + x1 + x2 + D:time, data = data, index=c("unit","time"), r = 2, force = "two-way", nboots = 100)

an error prompted:

Error in FUN(X[[i]], ...) : Calling var(x) on a factor x is defunct. Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

My data have two time-varying covariates, treatment indicator, time and unit factors. Could you show me the proper way to obtain heterogeneous treatment effect using gsynth package? Thank you in advance!

[yahoochen97]

I also tried not factoring time variable and another error occured:

Error in interFE.default(formula = NULL, data = data, Y = Yname, X = Xname, : Variable "time" is time-invariant. Try to remove it.

[xuyiqing]

Have you checked this out? https://yiqingxu.org/packages/gsynth/gsynth_examples.html

…

On Thu, May 27, 2021 at 8:06 PM Yehu Chen ***@***.***> wrote: I also tried not factoring time variable and another error occured: Error in interFE.default(formula = NULL, data = data, Y = Yname, X = Xname, : Variable "time" is time-invariant. Try to remove it. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#62 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB2PKGDYZVKCQWE635MOLNDTP4CE3ANCNFSM45VSW2YA> .