<>
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: [email protected]
[mailto:[email protected]] Im Auftrag von E. Paul Wileyto
Gesendet: Mittwoch, 1. April 2009 00:43
An: [email protected]
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" <[email protected]>
> To: <[email protected]>
> 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: <[email protected]>
>> To: <[email protected]>
>> 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
>>>
>>>
>>>
>>> *
>>> * For searches and help try:
>>> * http://www.stata.com/help.cgi?search
>>> * http://www.stata.com/support/statalist/faq
>>> * http://www.ats.ucla.edu/stat/stata/
>>>
>>
>> *
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
>>
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
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* http://www.stata.com/support/statalist/faq
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