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st: Requesting for help

Subject   st: Requesting for help
Date   Sun, 23 Aug 2009 04:31:56 -0700 (PDT)

Dear officer 

I was wondering your help for my situation

I am running a fixed effect regerssion for sample of 27 countries which are Sub sahara African countries for the 15 years 1993-2007. I am following one paper to model my specification .the paper has included time dummies in all the specification. however when i included time dummies my result dramatically get worse and moreover all time dummies are insginificant. so can you suggest me any solution ,help??
PS: my regression looks like 
xtreg lnGDP lnTrade Year dummies,fe i(countryid)


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