Causal effects that depend on the value of an observable variable, say W: a. cannot be...

  

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Causal effects that depend on the value of an observable variable, say W₁: a. cannot be estimated. b. can be estimated by interacting the treatment variable with W₁. c. result in the OLS estimator being inefficient. d. requires use of homoskedasticity-only standard errors. e. All of the above. f. None of the above. Causal effects that depend on the value of an observable variable, say W₁: a. cannot be estimated. b. can be estimated by interacting the treatment variable with W₁. c. result in the OLS estimator being inefficient. d. requires use of homoskedasticity-only standard errors. e. All of the above. f. None of the above.

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