Transcription of 1 The basics of panel data - University of California ...
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Introductory Applied EconometricsEEP/IAS 118 Spring 2015 Steven BuckNotes to accompany fixed effects material4-16-14 Related materials: Wooldridge 5e, Ch. : The Structure of Economic data Wooldridge 5e, Ch. : Pooling Independent Cross Sections across Time (ignore subsection on ChowTest). Wooldridge 5e, Ch. : Two-period panel data Analysis (stop once you finish the paragraph onheterogeneity bias at the end of p. 460). Wooldridge 5e, Ch. : Fixed Effects Estimation (ignore the last two subsections on Fixed Effectsor First Differencing and Fixed Effects with Unbalanced panels ). Handout #17 on Two year and multi-year panel data1 The basics of panel dataWe ve now covered three types of data : cross section, pooled cross section, and panel (also called longitudi-nal). In a panel data set we track the unit of observation over time; this could be a state, city, individual,firm, To help you visualize these types of data we ll consider some sample data sets 1.
treatment group dummy variable in the di erence-in-di erences regression speci cation. Just like the treatment group dummy variable controls for baseline di erences between the control and treatment groups, the city xed e ects (i.e. city dummy variables) control for baseline di erences between cities.
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