Consider the following model to estimate the effect of college quality on the natural logarithm of income

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Consider the following model to estimate the effect of college quality on the natural logarithm of income (among a sample of 40-year-old college graduates): 

In (income), =Bx(CQ), + Bx(score), + Bx(C_score_AVG), + XB +  where CQ = person i's college quality (key-X

a. Describe why there could be multicollinearity in this model, with regard to CQ. 

b. Describe why there could be heteroskedasticity in this model, with regard to CQ. 

c. Describe how there could be correlated error terms in this model. 

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