Two errors: (1) "Warning message: The demeaning algorithm did not converge, the results are not reliable. (tol: 1e-06, iter: 2036)" and (2) "Error: Class of the `.Dtreat` variable is class is not supported." about etwfe

[grantmcdermott]

Hi Simon,

It's tricky without having access to your data---can you at least print out the results of head(tk_cbs_test_12_21_80_t12_hosp_imp)?---but my first guess is that your imputed treatment date is mislaligned. Can you retry from step 2, except this time set the first.treat date to 2021?

[grantmcdermott]

Finally, I have one more question: is it also possible to use the staggered treatment with, in some cases, repeated treatments? To illustrate: suppose I have the relevant data for 2010, 2012, 2017 and 2021, but some neighbourhoods get treated multiple times (e.g. in between 2010 and 2012, but again in 2012 and 2017). Do I then just create a separate first.treat value for those groups, or is there another way around this?

I believe that the ETWFE framework should, conceptually, be able to handle multiple treatments as well as turning treatment off and on again. Unfortunately, I haven't coded that up in this implementation yet. You might consider the did_multiplegt package; though---fair warning---it's quite slow and not particularly well documented. I've written up an overview of it here.

[grantmcdermott]

@simonvanteutem, any updates on this?

[grantmcdermott]

Closing in the absence of further updates. Please let me know if there's still an issue.