I am new to econometrics and I am trying to perform a Group-Time Average Treatment Effects by using the function att_gt() from the did() library in R studio. I am trying to estimate the effect of mergers on R&D expenditures. I have a treatment group with mergers happening in 2014, 2015 and 2016 and a control group with no mergers happening. For both treatment and control I have data either for 2010-2018 or 2011-2019.

I get the following error : Error in aggregate.data.frame(as.data.frame(x), ...) : arguments must have same length

I created a subset with only the variables I am using in the code and made sure that they are all the same length. I also replaced all NAs with 0. However, I still get the same error. Does anybody have an idea what could be going wrong here?

This is my data

This is the code that I am using:

out <- att_gt(yname = "RD_Expense", gname = "treatment_year", idname = "Globa_Company_Key", tname = "Date_Year", xformla = ~SIC4 + ISO_Country_Code, allow_unbalanced_panel = TRUE, data = Mergers_dataset, )
summary(out)

I am trying to run this code because I have 3 treatment periods and I cannot think of aanother way to perform difference-in-differences. If anyone has other suggestions that would be appreciated.

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