sq - Midterm sample questions for Econ 642 April 2008 R de...

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Midterm sample questions for Econ 642 April 2008 R. de Jong 1. Consider the following dataset: we have panel data on 500 children whose parents divorced at age 8. For every year between ages 9 and 18, we have a measure of their psychologi- cal health y it (as measured by a standardized test) and a dummy variable x it that indicates whether or not child i received counseling in year t - 1. We are interested in the causal effect of counseling on psychological health. Someone runs a random effects regression of y it on x it . Why might a fixed effects regression be more appropriate in this setting? (Note: I am interested in the fundamental omitted vari- able problem with this random effects regression; the assumption is that a baseline measure of psychological health of child i , i.e. a i , is the omitted variable) 2. In the setup of the previous question, what results would you expect to obtain from a pooled regression?
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sq - Midterm sample questions for Econ 642 April 2008 R de...

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