Re: st: Synth - Quarterly Data

[Nick Cox <njcoxstata@gmail.com>]

That's fine. "Getting used to the commands" never stops.

Nick
njcoxstata@gmail.com


On 28 March 2014 11:31, Fonseca-Ferreira,V  (pgt)
<V.Fonseca-Ferreira@lse.ac.uk> wrote:
> Thanks guys.
>
> I am new to Stata, and I am still getting used to the commands.
>
> Thanks a lot for the help Nick and Dimitry.
>
> Best
>
> Vitor
>
> ________________________________________
> From: owner-statalist@hsphsun2.harvard.edu <owner-statalist@hsphsun2.harvard.edu> on behalf of Nick Cox <njcoxstata@gmail.com>
> Sent: 28 March 2014 11:14
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Synth - Quarterly Data
>
> Dimitry answered your question, although cleverly. If you feed
>
> trperiod(2007q1)
>
> you get an error as reported, but if you feed
>
> trperiod(`=tq(2007q1)')
>
> Stata will calculate -tq(2007q1)- on the fly. -synth- will see (in this case)
>
> trperiod(188)
>
> and should be happy. You get the best of both worlds. Start at -help
> macro- and read about expansion operators such as `= '.
>
> Nick
> njcoxstata@gmail.com
>
> On 28 March 2014 10:58, Fonseca-Ferreira,V  (pgt)
> <V.Fonseca-Ferreira@lse.ac.uk> wrote:
>> Yes, the numeric list is indeed my problem.
>> Maybe if I regenerate the quarterly data (gen date = quarterly (time, "YQ")). But then they will report the results with time specified like "145- 276" with treatment period being "170".
>> How could i make stata read my data as this but report 2007q1?
>
> Dimitriy V. Masterov
>
>> I am away from my computer so I cannot be 100% certain, but I believe
>> this is because the syntax calls for a numeric list and you're using
>> strings. Try doing something like `=tq(2007q1)'.
>
>  On Thu, Mar 27, 2014 at 2:04 PM, Fonseca-Ferreira,V  (pgt)
>
>>> I am studying counter factual GDP responses of the 2004 European Union entrants during the crisis in the absence of the Euro, and I intend to use the Synthetic Control Group Method from Alberto Abadie (synth command in stata).
>>> I have been trying to run it with quarterly data,but Stata does not seem to be able to recognize it, even though it seems to understand that I am working with quarterly data, according to the tsset function:
>>>
>>> . tsset  Country date
>>>        panel variable:  Country (strongly balanced)
>>>         time variable:  date, 1993q2 to 2013q4
>>>                 delta:  1 quarter
>>>
>>> When I try to run :
>>> synth  ln_GDP ln_GDP_1 ln_C ln_I ln_GC ln_X ln_M , trunit(33) trperiod(2007q1)figure counit(6 16 21 22 28) xperiod(1995q2(1) 2006q4) mspeperiod(1995q2(1) 2006q4) resultsperiod(1995q2(1) 2013q3) nested keep(Slovenia)
>>>
>>> I get the error message "trperiod() invalid -- invalid number r(121);" where trperiod(2007q1) is the period the treatment "Euro" was introduced in Slovenia. I believe the problem lies in the "q" in "2007q1", and that this would also be a problem for xperiod; mspeperiod; and resultsperiod. Any ideas on how can I correct this?

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