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From   george owuor <[email protected]>
To   statalist <[email protected]>
Date   Sun, 19 Nov 2006 07:14:41 -0800 (PST)

Dear all,

i am running instrumental variables estimations. y=f(X,W),  and W is endogenours,  so stage one becomes W=f(Z), and stage 2 becomes  y=f(X, Predicted W). My function is aproduction function with conventional inputs such as fertiliser, seeds, labour and then credit which is the (W).  Must the number of RHS variables  in stage one be the same number as RHS ones in stage two.

Please help.


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