st: How to 'predict' residual by region? Seasonal adjustment?

[Galina An <ang@kenyon.edu>]

Dear stata users,
I have another related question. I need to 'predict' residual by region. 
When I run the following code it only uses the coefficients from the 
last regression to predict residuals:

by region: reg  migration t2 t3 t4
predict  r,  resid

if I try to do the loop, it says that r is already defined:

levelsof region_code, local(levels)
foreach levl of local levels {
       reg migration t4 t2 t3 if region_code == `levl'
      predict r, resid
}

Also, does anybody know a good seasonal adjustment procedure in Stata?
Thank you!

--
Galina An
Assistant Professor
Economics Department
Kenyon College

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