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st: one way/two way fixed effects


From   valentina p <valendena@hotmail.it>
To   statalist statalist <statalist@hsphsun2.harvard.edu>
Subject   st: one way/two way fixed effects
Date   Tue, 4 Dec 2007 23:46:57 +0100

Hi to everyone,I have data of 15 regions over 15 years and I am trying to understand which model to use to estimate the impact of immigration on per capita income. Now I have to choose between a one-way and a two-way fixed effects model. 

For this reason, I have two big "groups of question" (sorry in advance). 

1)To control for regions and time I suppose that a two-way fixed effects model can be useful, but I do not know the commands for stata. 
I have read an example in a manual like:

 xtreg lc ly lpl lpm year2-year11, re 

dropped year1, which becomes the reference.

 Then the results are 

          coef.         P>|z| 
ly        .7409992      0.000
lpl       .1669597      0.026 
lpm     .666226        0.000
year2  .0464402      0.019
year3  -.0744206     0.036
 |
 |
year11 -.0460081    0.740
_cons     2.4982631 0.002  

whith the respective coefficients.
 How can I interpret them and the constant term? I refer most of all to the coeffs of year2-year11. 
In which sense can I interpret them like variations from the year1? I mean...what does this explain? which effects?
and how can I interpret the rule of(in the example let it be) ly, the variable which I am principally studying?  

2) Apart from this, if used a one way fixed effect model like xtreg y x1 x2 ... ,fe would it be necessary to make an analysis of the residuals? If yes, through which commands? 

 Many many thanks to everyone who could help me 

 val 
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