(Requires Appendix Material) When the Fifth Assumption in the Fixed $\left( \operatorname { cov } \left( u _ { i t } , u _ { i s } \mid X _ { i i } , X _ { i s } \right) = 0 \text { for } t \neq s \right)$

question 29

Multiple Choice

(Requires Appendix material) When the fifth assumption in the Fixed Effects regression $\left( \operatorname { cov } \left( u _ { i t } , u _ { i s } \mid X _ { i i } , X _ { i s } \right) = 0 \text { for } t \neq s \right)$ is violated, then

• A) using heteroskedastic-robust standard errors is not sufficient for correct statistical inference when using OLS.
• B) the OLS estimator does not exist.
• C) you can use the simple homoskedasticity-only standard errors calculated in your regression package.
• D) you cannot use fixed time effects in your estimation.

---

Definitions:

Loan Payment

A payment made by a borrower to a lender, consisting of both principal and interest, on a borrowed sum.

Compounded Quarterly

The process of calculating interest on both the initial principal and the accumulated interest from previous periods, done four times a year.

Withdraw

The process of withdrawing money from an account, investment, or deposit.

Interest

Interest is the charge for borrowing money, typically expressed as an annual percentage rate, representing compensation to the lender for the risk and opportunity cost of lending funds.