Thanks, Martin and Michael, both for your hints and for the exegetic

exercise on my words, which I found amusing.

-rolling- seems to be doing the job I want, especially if combined

with "[r]recursive". The problem I see there is that I can perform

only one command within the "frame" of this rolling window, not a

series of commands (like postestimation commands), as I was thinking

of when specifying it as a loop.

That's why I agree with Michael's points, and I find your solution,

Martin, to use a loop beforehand to fill a -local- with the desired

end dates very promising.

@ Martin: I did not really care about what kind of list, I was indeed

just trying to explain my goal in pseudo-code. So am I allowed to

rephrase my suggestion before, inventing a new type of list, call it

"timelist"? That would have been my dream (and to all German readers:

please note the "pseudo" in "pseudo-code"):

*** begin pseudo-code

foreach t of timelist 1992q1/2000q4 {

reg y L.y L.x if tin(1960q1, `t')

}

*** end pseudo-code

Best, and thanks again! AC

On Wed, Dec 3, 2008 at 4:34 PM, Martin Weiss <

[hidden email]> wrote:

> BTW, Augusto did not even pretend that his was a -numlist-; if he had

> thought it was one, he would have said something like "...of numlist

> blabla". His example looks like "any_list" in the -h foreach- parlance. He

> could of course use a loop beforehand to fill a -local- with the desired end

> dates and use that in the -foreach- ...

>

> HTH

> Martin

> _______________________

> ----- Original Message ----- From: "Michael Hanson" <

[hidden email]>

> To: <

[hidden email]>

> Sent: Wednesday, December 03, 2008 10:29 PM

> Subject: Re: st: Re: Running a foreach loop over a sequence of dates

>

>

>> Ah, so true -- but by labeling it as "pseudo-code", Augusto indicated that

>> he already knew that. Nonetheless, looping over dates would be *extremely*

>> high on my list of wishes & grumbles! Perhaps in Stata 11.... or even 10.2.

>> (Since, in the end, dates are just formatted numbers, this seems as if it

>> should be possible in theory.) There are applications in which something

>> much more light-weight than - rolling- would be appropriate. Although I

>> agree that the example below could likely be accomplished with -rolling-.

>>

>> -- Mike

>>

>> On Dec 3, 2008, at 4:05 PM, Martin Weiss wrote:

>>

>>> You cannot simply abbreviate your list of end dates like a - numlist-

>>> with a slash and hope for Stata`s acquiescence... I would recommend you

>>> look at -h rolling-

>>>

>>> HTH

>>> Martin

>>> _______________________

>>> ----- Original Message ----- From: "Augusto Cadenas"

>>> <

[hidden email]>

>>> To: <

[hidden email]>

>>> Sent: Wednesday, December 03, 2008 10:02 PM

>>> Subject: st: Running a foreach loop over a sequence of dates

>>>

>>>

>>>> Hello,

>>>>

>>>> I am trying to run a series of commands in a time series setting, and

>>>> interested in using variable time intervals (variable time windows, or

>>>> variable start/end dates). So ideally, I would like to loop with

>>>> -foreach- over a series of dates, but I cannot find the way of doing

>>>> this. To give you an idea of the kind of problem, here it is in

>>>> pseudo-code (not working):

>>>>

>>>> *** begin pseudo-code

>>>>

>>>> foreach t in 1992q1/2000q4 {

>>>> reg y L.y L.x if tin(1960q1, `t')

>>>> reg y L.y L.x if tin(`=`t'-20', `t')

>>>> }

>>>>

>>>> *** end pseudo-code

>>>>

>>>> I am sorry if this is a trivial question, but I really could not find

>>>> a way of performing this. Thanks for any hints.

>>>>

>>>> AC

>>>> *

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>>>

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