Which of the Following Is a Limitation of Serial Correlation-Robust

Multiple Choice

Which of the following is a limitation of serial correlation-robust standard errors?

A) The serial correlation-robust standard errors are smaller than OLS standard errors when there is serial correlation.
B) The serial correlation-robust standard errors can be poorly behaved when there is substantial serial correlation and the sample size is small.
C) The serial correlation-robust standard errors cannot be calculated for autoregressive processes of an order greater than one.
D) The serial correlation-robust standard errors cannot be calculated after relaxing the assumption of homoskedasticity.