st: clustering necessary for xtreg, fe i(id)?

[Scott Cunningham <scunning@gmail.com>]

I have an individual-level panel dataset and am estimating a fixed  
effects model using -xtreg-.  I had been operating off an assumption  
- which I thought was correct but now think is incorrect - that - 
xtreg, fe i(id)- would automatically adjust for correlation between  
the individual errors.  But this is incorrect, no?  I should include  
the cluster(id) syntax if I want to correct for this problem, right?

sc
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