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Which of the following assumptions is required for obtaining unbiased fixed effect estimators? a.The errors are serially correlated. b.The explanatory variables are strictly exogenous. c.The

Which of the following assumptions is required for obtaining unbiased fixed effect estimators?

a.The errors are serially correlated.

b.The explanatory variables are strictly exogenous.

c.The unobserved effect is correlated with the explanatory variables.

d.The errors are heteroskedastic.

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