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ECN 702 Econometrics II HW2 Due: Jan 29 1. Suppose the true conditional mean function is but by mistake, a researcher ran least square regression without the term as in Assume cov (Xi, U.) = 0, E (Xn] = 0 and 티x?]-1. Is hisher estimate consistent for β? If not, show which OLS assumption fails and discuss potential solutions. 2. Assume the structural equation is where E [ui|X] of the real value X 0. It was discovered that we observe X, with a measurement error w, instead It is known that E [w1-0,V (wi) 07, cou (x, , ul-cou (ui, wi)-0. The OLS estimator is based on regressing Y, on a constant and X () Find the value to which the OLS estimator of B, is consistent for (ii) Is the value equal to the true value β? If not, how is the bias related to the tre value? (ii) Assume we have a consistent estimator for . How would you make a correction to consistently estimate β? (iv) Discuss other potential solutions when such estimator in (iii) is not available.

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