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: year variables in xtabond


From   Sjoerd van Bekkum <vanbekkum@ese.eur.nl>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: year variables in xtabond
Date   Thu, 3 Jan 2013 03:03:06 +0100

Andre,

- Your "no observations" error can have many causes unrelated to
estimation (such as including a string variable in your model).
- The abond.dta contains dummies generated perhaps by something as
"tab year, gen()". However, in your own dataset, abond probably works
fine with a prefix such as "xi: abond y x .... i.year, ....."
- I don't think you want to include the year variable AND the dummies
- To use dynamic panel estimators wisely, read Roodman's paper
available at http://www.cgdev.org/content/publications/detail/14256.and
his other paper cited therein.

---

Sjoerd van Bekkum
Erasmus University, Netherlands
W  http://people.few.eur.nl/vanbekkum/    P (+31)-10-4082114   F (+31)
10 - 40 89165



On 2 January 2013 22:36, André Ferreira Coelho
<andre.f.coelho2011@novasbe.pt> wrote:
>
> Dear statalist,
>
> I have a basic question regarding xtabond. I have just realized that
> factor variables are not allowed when using -xtabond-.
> How would you control then for individual year effects? I simply tried to
> generate dummy variables for each year but seems that -xtabond-routine does
> not handle them since an error message stating that there are no
> observations is issued.
> Stata manual uses abdata.dta,-webuse abdata-, which contains dummy
> variables in such a way they are labelled for instance as "year==1980",
> which means that they were generated considering in some way the time
> variable year applied in xtset.
>
> So, basically what I pretend is just to include individual time controls
> such as those used in the manual (i.e. yr1980-yr1984) in addition to the
> variable year.
>
> Do you know how to do this?
>
> Best regards,
>
> Andre Coelho
> *
> *   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/

*
*   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