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st: OLS and IV have opposite sign

From   Shikha Sinha <>
Subject   st: OLS and IV have opposite sign
Date   Mon, 15 Oct 2012 12:58:09 -0700

Dear all,

I am estimating an Ordinary least square (OLS) and Instrument variable
(IV) model, however the signs are opposite to each other. The OLS
coeff is negative, while the IV coeff is positive. Could anyone
explain what the signs in these two models are different- is there any
econometric reason for this?

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