1 Review of the Basic Methodology

Imbens/Wooldridge, Lecture Notes 10, Summer 07 What s New in Econometrics?NBER,Summer 2007 Lecture 10,Tuesday,July 31st, pmDifference-in- differences EstimationThese notes provide an overview of standard difference-in- differences methods that havebeen used to study numerous policy questions. We consider some recent advances in Hansen(2007a,b) on issues of inference, focusing on what can be learned with various group/timeperiod dimensions and serial independence in group-level shocks. Both the repeated crosssections and panel data cases are considered. We discuss recent work by Athey and Imbens(2006) on nonparametric approaches to difference-in- differences , and Abadie, Diamond, andHainmueller (2007) on constructing synthetic control of the Basic MethodologySince the work by Ashenfelter and Card (1985), the use of difference-in-differencesmethods has become very widespread.

Imbens/Wooldridge, Lecture Notes 10, Summer ’07 What’s New in Econometrics? NBER, Summer 2007 Lecture 10, Tuesday, July 31st, 4.30-5.30 pm Difference-in-Differences Estimation These notes provide an overview of standard difference-in-differences methods that have

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