"Some units have too few pre-treatment observations. Try to remove them."

[ahearn15]

I noticed with the gsynth package, you automatically remove observations that do not reach the min.t0 threshold:

gsynth:

Some treated units has too few pre-treatment periods; they are removed automatically.

fect:

Error in fect.cv(Y = Y, X = X, D = D, I = I, II = II, T.on = T.on, T.off = T.off, : Some units have too few pre-treatment observations. Try to remove them.

Would it be possible for that feature to be added to fect?

[xuyiqing]

Sure. That's doable. Thanks for the suggestion.

On Tue, Jun 2, 2020 at 7:56 PM Adam Hearn notifications@github.com wrote:

I noticed with the gsynth package, you automatically remove observations that do not reach the min.t0 threshold:

gsynth:

Some treated units has too few pre-treatment periods; they are removed automatically.

fect:

Error in fect.cv(Y = Y, X = X, D = D, I = I, II = II, T.on = T.on, T.off = T.off, : Some units have too few pre-treatment observations. Try to remove them.

Would it be possible for that feature to be added to fect?

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-- Yiqing Xu

Assistant Professor Department of Political Science Stanford University http://yiqingxu.org/

[ahearn15]

Great, thank you! Keep up the awesome work.

[liqizheng0328]

when using your amazing package, I found that it reported the error: Some units have too few pre-treatment observations. Try to remove them. But owing to my date which lacks enough pre-treatment observations, I still want to have a try on scm despite it does not perform well even badly. So what can I do to remove this error or limit.( which may guarantee the credibility of results) I would appreciate some feedback on it. THANK YOU!!!

[xuyiqing]

Hi, You can set min.T0 to a small number.

On Tue, Oct 11, 2022 at 9:41 AM liqizheng0328 @.***> wrote:

when using your amazing package, I found that it reported the error: Some units have too few pre-treatment observations. Try to remove them. But owing to my date which lacks enough pre-treatment observations, I still want to have a try on scm despite it does not perform well even badly. So what can I do to remove this error or limit.( which may guarantee the credibility of results) I would appreciate some feedback on it. THANK YOU!!!

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-- Yiqing Xu

Assistant Professor Department of Political Science Stanford University https://yiqingxu.org/

[liqizheng0328]

Hi, You can set min.T0 to a small number. … On Tue, Oct 11, 2022 at 9:41 AM liqizheng0328 @.> wrote: when using your amazing package, I found that it reported the error: Some units have too few pre-treatment observations. Try to remove them. But owing to my date which lacks enough pre-treatment observations, I still want to have a try on scm despite it does not perform well even badly. So what can I do to remove this error or limit.( which may guarantee the credibility of results) I would appreciate some feedback on it. THANK YOU!!! — Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AB2PKGCFQEVVGMM4VKST2R3WCWKD5ANCNFSM4NRIMHIQ . You are receiving this because you commented.Message ID: @.> -- Yiqing Xu Assistant Professor Department of Political Science Stanford University https://yiqingxu.org/

Error in gsynth.default(formula = NULL, data = data, Y = Yname, D = Dname, : Some treated units has too few pre-treatment periods. Please set a larger value for min.T0 to remove them. Equal or greater than 6 is recommended.

THANK FOR YOUR REPLY！ It seems that this function does not allow me to do that.