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From |
"Gao Liu" <gao.liu@gmail.com> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: Disentangle unobserved state effect |

Date |
Wed, 1 Aug 2007 22:40:37 -0400 |

Dear list subscribers: Sorry that my question is not about Stata, but about econometrics. I am examining the impacts of some state-imposed policies, measured as a set of dummy variables, on school districts. Some states adopt some of these policies, others not. But if a state adopts one policy, it would apply to all school districts in the state. In other words, a policy dummy variable has the same value for all school districts within the same state. The dataset is an unbalanced panel, containing a sample of school districts from different states in different periods. School district that appear in this period generally would not be in the dataset next period, although some exceptions exist. Policies were adopted before the start period I am looking at. And during my examining period, no states change their policies. The problem is: since the dummy variables of interest are linear combination of states, we can't include state dummy variables. Thus, the results of the impact of these policies on school districts may capture some unobserved state-wide effects. It is not so convincing to simply interpret the coefficients of those dummy variables as the policy impacts. Is there any way to solve this problem? Thank you very much. Gao * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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