Which of the following can cause OLS estimators to be biased? | Cheap Nursing Papers

Which of the following can cause OLS estimators to be biased?

Which of the following can cause OLS estimators to be biased? Please explain.

(a) A sample correlation coefficient of .99 between two independent variables both included in the model.

(b) When one independent variable can be expressed an exact linear function of two or more of the other independent variables

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