Quiz1-v1 - QuizonRegression/StatisticsBasics[32points]...

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Quiz on Regression / Statistics Basics [32 points] Name  [1 point]:________________________________________________________ 1. [4 points] The fundamental problem of causal inference is that (select one) a. People are often self-selected, and so we can’t necessarily take differences in  outcomes as the causal effect of whatever “treatment” we’re studying b. We can never observe the counterfactual c. Convincing natural experiments are difficult to find d. Experiments are often not possible in economics 2. [4 points] Which are true? (more than one can be true) a. No assumptions are necessary for experiments to produce causal estimates b. The assumptions necessary for experiments to produce causal estimates are very  plausible because of random assignment c. Causal inference always requires us to make untestable assumptions d. As long as random assignment is done correctly, any difference in outcomes  between “treatment” and “control” groups definitely means there is a causal  effect. 3. [4 points] A researcher is studying the effect of computer use on wages.  He obtains from  the Census Bureau on the average wages in different U.S. cities, and from the Bureau of  Labor Statistics data on the share of workers using computers in that city.  He uses the  data to estimates a multivariate regression ( 29 ( 29 c c c c c u X X Wrkr Computers wage + + + + + = ... ln 3 3 2 2 1 0 β ...where X 2 , X 3 , etc. are various controls.  He retains the residuals from this regression for 
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This document was uploaded on 01/31/2011.

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Quiz1-v1 - QuizonRegression/StatisticsBasics[32points]...

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