[R] problem with the plm package

[Helen Chen]

Dear R help, 
      I use the package plm  the function plm() to analyse a panel data and 
   estimate a fixeffect model.
   I use the code as follow :
    fe <- plm(y~x+z, data, model = "within")
   But my result have no intercept.why?  I consult the paper plm.pdf , but I
can't find any answer.
   Can I estimate a model with intercept?

   Thanks, 
   Helen Chen 
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