st: error i ( ) required r (198)

["Seema Bhatia" <ler02sb@reading.ac.uk>]

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/