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]
st: RE: Does xtreg (or xtivreg) assume equally spaced time points?
From
"Schaffer, Mark E" <[email protected]>
To
<[email protected]>
Subject
st: RE: Does xtreg (or xtivreg) assume equally spaced time points?
Date
Tue, 7 Aug 2012 16:27:56 +0100
Lisa,
The model you specify below,
> Our model is: xtivreg depper (bmi = momobes)
has no apparent time dimension, i.e., it seems to be a static model. If
so, the spacing between consecutive periods is irrelevant and you don't
need to do anything.
HTH,
Mark
> -----Original Message-----
> From: [email protected] [mailto:owner-
> [email protected]] On Behalf Of Lisa Marie Yarnell
> Sent: 07 August 2012 15:32
> To: [email protected]
> Subject: st: Does xtreg (or xtivreg) assume equally spaced time
points?
>
> Hi Statalisters,
>
> Does xtreg (or really, what we are using, xtivreg--the extension of
xtreg that
> allows for an instrument) asusme equally-spaced time points in the
panel
> model?
>
> We have four waves of data.
> Wave I and Wave II are 1.5 years apart.
> Wave II and Wave III are 5.5 years apart.
> Wave III and Wave IV are 6 years apart.
>
> Is it wrong to put data from these time points into the xtivreg model?
Is
> there a way to adjust the model for unequally spaced time points?
>
> Our model is: xtivreg depper (bmi = momobes)
>
> How can we alter the model to account for the unequal spacing?
>
> Thanks,
> 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/
--
Heriot-Watt University is the Sunday Times
Scottish University of the Year 2011-2012
We invite research leaders and ambitious early career researchers to
join us in leading and driving research in key inter-disciplinary themes.
Please see www.hw.ac.uk/researchleaders for further information and how
to apply.
Heriot-Watt University is a Scottish charity
registered under charity number SC000278.
*
* 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/