st: how to create a loop for all the feasible regressions in a varlist

[Stefano Lombardi <ste85@fastwebnet.it>]

Dear all,

Starting from a list of 4 variables, I need to:
    - regress var1 on var2, var3, var 4
    - regress var2 on var1, var3, var4
and so on..
Basically I need to create a loop where every time the dependent 
variable is regressed on all the three others.

I have been trying to use the "foreach" command, but I cannot find the 
right way to solve the issue. In fact if I type:

 foreach x in Gasp PNC PUC PPT {
    reg `x' Gasp PNC PUC PPT
    }

the software, obviusly, every time returns an erroneous model (R^2 = 1), 
because in each model the dependent variable is explained by itself..
The point is that I have no idea on how to remove the `x' variable from 
the regressors list.

Thank you everyone in advance,

Stefano Lombardi
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