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

[Milena Przheska <milena.przheska@cosmicdevelopment.com>]

Actually, I'm using time to account for autocorrelation between
events. The syntax is

mixed positive ib(2).vertical || id:R.vertical, residuals(ar 1,
t(time1)) covariance(exchangeable)



On Tue, Nov 12, 2013 at 1:07 PM, William Buchanan
<william@williambuchanan.net> wrote:
> Can you send the syntax that is generating the error?  Are you using time to
> identify level 2 or higher units?  Have you been able to replicate your
> problem with any publicly available datasets so that other listserv members
> can have a better idea of what you problem is?
>
> HTH,
> Billy
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Milena Przheska
> Sent: Tuesday, November 12, 2013 6:01 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: duplicated datetime variable differs from original datetime
> variable it was derived from
>
> The problem is that my time1 variable is double, and yet, when using
> it in the model, it gives that error message
>
> On Tue, Nov 12, 2013 at 12:54 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> Same answer. Use a -double-.
>>
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 12 November 2013 11:51, Milena Przheska
>> <milena.przheska@cosmicdevelopment.com> 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 <njcoxstata@gmail.com> 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
>>>> njcoxstata@gmail.com
>>>>
>>>>
>>>> On 12 November 2013 11:33, Phil Clayton <philclayton@internode.on.net>
> 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
> <milena.przheska@cosmicdevelopment.com> 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
>>>>>>
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