Question: Consider the binary variable version of the fixed effects model in Equation (10.11), except with an additional regressor, D1, that is, let Y Bo+BXYD1, +

Consider the binary variable version of the fixed effects model in Equation (10.11), except with an additional regressor, D1, that is, let Y Bo+BXYD1, + y2D2, ++yDn; +u..

a. Suppose that n=3. Show that the binary regressors and the "con- stant" regressor are perfectly multicollinear, that is, express one of the variables D1, D2, D3, and Xo, as a perfect linear function of the others, where X1 for all i,t.

b. Show the result in

(a) for general n.

c. What will happen if you try to estimate the coefficients of the regres sion by OLS?

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