Seema,
Others can correct me if I am wrong, but I believe that you need to
set the variable of the groups across which you are comparing,
otherwise Stata doesn't know how to group the outcomes to measure the
fixed effects.
You can either add the option i(<grp_varname>) to the end of the command
[i.e. xtreg lngdpimp lngdpexp lnpopimp lnpopexp ldist, fe i(<grp_varname>)]
or set the group variable using:
iis <grp_varname>
which will set the group variable for all future xt commands.
mike
On 7/31/07, Seema Bhatia <[email protected]> wrote:
> Hello there
>
> I am trying to do a hausman test in stata using my dataset and i keep
> getting the following message
> i () required
> r (198)
>
> (the command line is
> xtreg lngdpimp lngdpexp lnpopimp lnpopexp ldist, fe)
>
> This has something to do with the syntax but what am I doing wrong? No
> matter what I change, I keep getting the message
>
> Please help
>
> Thanks
>
> Seema
>
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
