Dear Rusers,
  I want to compare the different methods of variable selction in
linear/logistic regression, so i want to generate simulated datasets, how to
do that?
e.g.
 response variable:y
independent variables:x1-x4
residual item:e
the theoretical formula is: y=2.1+0.1*x1+0.2*x2
x3,x4 are not related with y
How should i do that?
Thanks very much!
!!SOS!!

-- 
Kind Regards,
Zhi Jie,Zhang

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