Which of the following statements are true? a. The standard error of a regression, 6, is not an unbiased estimator for σ, the standard deviation of the error, u, in a multiple regression model. b. In time-series regressions, OLS estimators are always unbiased. c. Almost all economists agree that unbiasedness is a minimal requirement for an estimator in regression analysis. d. All estimators in a regression model that are consistent are also unbiased. ○ a. a O b. b О с. O d. d

ENGR.ECONOMIC ANALYSIS
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Which of the following statements are true?
a. The standard error of a regression, 6, is not an unbiased estimator for σ,
the standard deviation of the error, u, in a multiple regression model.
b. In time-series regressions, OLS estimators are always unbiased.
c. Almost all economists agree that unbiasedness is a minimal requirement for an
estimator in regression analysis.
d. All estimators in a regression model that are consistent are also unbiased.
○ a. a
O b. b
О с.
O d. d
Transcribed Image Text:Which of the following statements are true? a. The standard error of a regression, 6, is not an unbiased estimator for σ, the standard deviation of the error, u, in a multiple regression model. b. In time-series regressions, OLS estimators are always unbiased. c. Almost all economists agree that unbiasedness is a minimal requirement for an estimator in regression analysis. d. All estimators in a regression model that are consistent are also unbiased. ○ a. a O b. b О с. O d. d
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