Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: duplicated datetime variable differs from original datetime variable it was derived from


From   Nick Cox <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: duplicated datetime variable differs from original datetime variable it was derived from
Date   Tue, 12 Nov 2013 11:54:15 +0000

Same answer. Use a -double-.

Nick
[email protected]


On 12 November 2013 11:51, Milena Przheska
<[email protected]> wrote:
> When I try to fit a mixed effects model with the time1 variable as
> defined above, I get an error message "time variable must be
> integer-valued".
>
> I do need the time variable to be by the second, otherwise I will have
> duplicate values for the time variable.
>
> If you have any suggestions, I would very much appreciate it.
>
> Thank you,
> Milena
>
> On Tue, Nov 12, 2013 at 12:41 PM, Nick Cox <[email protected]> wrote:
>> Phil has the answer in one. Unfortunately, you do have to keep
>> remembering that a date-time to Stata is just an integer, usually
>> large, giving time in milliseconds.
>>
>> . di %14.0f clock("07jun2012 03:11:48", "DMYhms")
>>  1654657908000
>>
>> Numbers that big have to be stored as -double-s.
>> Nick
>> [email protected]
>>
>>
>> On 12 November 2013 11:33, Phil Clayton <[email protected]> wrote:
>>> Dates with times need to be stored in double precision. Try:
>>> gen double time1=time
>>>
>>> See -help datetime-
>>>
>>> Phil
>>>
>>> On 12 Nov 2013, at 10:25 pm, Milena Przheska <[email protected]> wrote:
>>>
>>>> Dear Statalist members,
>>>>
>>>> When duplicating a time variable by typing
>>>>
>>>> gen time1 =time
>>>>
>>>> the new variable time1 is off by several seconds from the variable time, so
>>>>
>>>> time
>>>> 06jun2012 22:44:51
>>>> 06jun2012 22:44:54
>>>> 06jun2012 22:44:56
>>>> 07jun2012 01:39:58
>>>> 07jun2012 01:40:05
>>>> 07jun2012 01:40:45
>>>> 07jun2012 03:09:48
>>>> 07jun2012 03:09:48
>>>> 07jun2012 03:11:06
>>>>
>>>> becomes
>>>>
>>>> time1
>>>> 06jun2012 22:45:17
>>>> 06jun2012 22:45:17
>>>> 06jun2012 22:45:17
>>>> 07jun2012 01:40:03
>>>> 07jun2012 01:40:03
>>>> 07jun2012 01:40:03
>>>> 07jun2012 03:09:37
>>>> 07jun2012 03:09:37
>>>> 07jun2012 03:11:48
>>>>
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index