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AW: st: Re: Re: dates in stata


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: Re: Re: dates in stata
Date   Wed, 1 Apr 2009 13:52:58 +0200

<> 

My thought is that the "20" is unnecessary as it is useful for 2-digit years
only. See

*************
help dates_and_times, mark(twodigit)
*************



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von E. Paul Wileyto
Gesendet: Mittwoch, 1. April 2009 00:43
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: Re: Re: dates in stata

Did this date function work the same way in Stata 8 or 9?... or was it 
more limited?

I suggested to Lisa other notations such as

gen dateval=date( event_date, "D M 20Y")

Any thoughts?

Paul

Martin Weiss wrote:
> <>
>
> Lisa requested additional information in a private email to me. She 
> said that Paul`s help did not solve her problem and that she ended up 
> with all missings for the string-to-date transformed variable. I 
> recreate her prob below, it works perfectly for me...
>
> ****
> clear*
> inp str15 company_id str20 event_date
> Nintendo  "9 May 2006        "
> Palm      "18 May 2005       "
> Apple     "23 October 2001   "
> Apple     "7 September 2005  "
> Apple     "11 January 2005   "
> Apple     "6 January 2004    "
> Apple     "5 September 2007  "
> Apple     "9 January 2007    "
> Apple     "7 August 2007     "
> Apple     "1 May 2001        "
> Apple     "15 January 2008   "
> Apple     "14 October 2008   "
> LG        "11 December 2006  "
> LG        "11 February 2008  "
> Pioneer   "7 January 2008    "
> end
>
> compress
> gen dateval=date(event_date, "DMY")
> format dateval %td
> sort dateval
> l
> ****
>
>
>
> HTH
> Martin
> _______________________
> ----- Original Message ----- From: "Martin Weiss" <martin.weiss1@gmx.de>
> To: <statalist@hsphsun2.harvard.edu>
> Sent: Tuesday, March 31, 2009 11:28 PM
> Subject: st: Re: dates in stata
>
>
>> <>
>>
>> Lisa may also profit from Nick`s 
>> http://www.stata-journal.com/sjpdf.html?articlenum=pr0006
>>
>> The essential point here is that you read in your dates as strings, 
>> and when you fire up -sort- it sorts like you would sort, say, 
>> surnames: according to the alphabet.
>>
>> Once you have applied the string-to-date functions recommended in 
>> this thread and described under -help dates_and_times, 
>> mark(str2num)-, dates are defined as number of days from 1/1/1960. 
>> This allows you to sort a numeric variable, although it is still 
>> displayed as 1/8/2008, according to the format you apply to the new 
>> variable...
>>
>> HTH
>> Martin
>> _______________________
>> ----- Original Message ----- From: <lschoele@rumms.uni-mannheim.de>
>> To: <statalist@hsphsun2.harvard.edu>
>> Sent: Tuesday, March 31, 2009 10:44 PM
>> Subject: st: dates in stata
>>
>>
>>> Hello Statalist,
>>>
>>> I am using Stata for event study. I entered all my variables and 
>>> observations.
>>> Regarding my variable "date" I have a problem. When I use "sort 
>>> date", stata  sorts the date shown above:date
>>> 01 April 2002
>>> 01 April 2003
>>> 01 April 2004
>>> 01 April 2005
>>> 01 April 2008
>>> 01 August 2000
>>> 01 August 2001
>>> 01 August 2002
>>> 01 August 2003
>>> 01 August 2005
>>> 01 August 2006
>>> 01 August 2007
>>> 01 August 2008
>>> 01 December 2000
>>> 01 December 2003
>>> 01 December 2004
>>> 01 December 2005
>>> 01 December 2006
>>> 01 February 2000
>>> 01 February 2001
>>> 01 February 2002
>>> 01 February 2005
>>> 01 February 2006
>>> 01 February 2007
>>> 01 February 2008
>>> 01 July 2002
>>> 01 July 2003
>>> 01 July 2004
>>> 01 July 2005
>>> 01 July 2008
>>> 01 June 2000
>>> 01 June 2001
>>> 01 June 2004
>>> 01 June 2005
>>> 01 June 2006
>>> 01 June 2007
>>> 01 March 2000
>>> 01 March 2001
>>> 01 March 2002
>>> 01 March 2004
>>> 01 March 2005
>>> 01 March 2006
>>> 01 March 2007
>>> 01 May 2000
>>> 01 May 2001
>>>
>>> I can tell that stata sorts by the first letter of the month. Do I  
>>> have to use a special format for the date? I also tried the format 
>>> 01.04.2002, but that gives me the same sortation shown above.
>>>
>>> Can anyone help me?
>>>
>>> Best regards
>>> Lisa
>>>
>>>
>>>
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>>
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>
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