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Re: st: date subtraction


From   "moleps islon" <moleps2@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: date subtraction
Date   Sun, 21 Dec 2008 13:38:24 +0100

Gracias...Appreciate it..

Moleps


On Thu, Dec 18, 2008 at 6:02 PM, Jeph Herrin <junk@spandrel.net> wrote:
>
> Yep, looks like opdate is 2205, not 2005:
>
>  . di mdy(10,4,2005)-mdy(6,22,2205)
>  -72944
>
>
>
>
> dr kardos laszlo wrote:
>>
>> moleps, looks like your fudate and pfudate in obs 83 are about two
>> centuries behind. check out the values of those observations without date
>> formatting, you will see negative integers if i'm right. generally, it is a
>> good idea to use 4-digit years when formatting dates.
>>
>> laszlo
>>
>> moleps islon wrote:
>>>
>>> IN generating the timevariabel for a cox model I get the follwing.
>>> Everything is perfect, except id 83. Any idea why??
>>>
>>> gen futime=fudate-opdate
>>> gen pfutime=pfudate-opdate
>>> gen coxtime=pfutime if pfutime>futime &pfutime<.
>>> replace coxtime=futime if pfutime==.
>>> replace coxtime=pfutime if futime==.
>>> list opdate fudate pfudate futime pfutime coxtime
>>>
>>>
>>>    |    opdate      fudate     pfudate   futime   pfutime   coxtime |
>>>  76. | 10 Nov 04   18 Apr 05   23 May 08      159      1290      1290 |
>>>  77. | 25 May 04   16 Sep 04   23 May 08      114      1459      1459 |
>>>  78. | 24 Aug 04   01 Dec 04   30 Jun 08       99      1406      1406 |
>>>  79. | 28 Feb 05   22 Sep 05   26 Jun 08      206      1214      1214 |
>>>  80. | 06 Jan 05   13 Apr 05   15 Oct 08       97      1378      1378 |
>>>     |----------------------------------------------------------------|
>>>  81. | 10 Jan 05   18 Apr 05   15 Sep 08       98      1344      1344 |
>>>  82. | 14 Apr 05   06 Jun 05   25 Jun 08       53      1168      1168 |
>>>  83. | 22 Jun 05   04 Oct 05   24 Jun 08   -72944    -71950    -71950 |
>>>  84. | 15 Jan 87   10 Feb 96           .     3313         .      3313 |
>>>  85. | 31 Aug 92   20 Mar 94           .      566         .       566 |
>>>     |----------------------------------------------------------------|
>>>
>>> Regards,
>>> Moleps
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>>>
>>
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