双重差分模型(Differences-in-Differences,DID),其常用于政策评估效应研究,比如研究‘鼓励上市政策’、‘开通沪港通’、‘开通高铁’、‘引入新教育模式’等效应时,分析效应带来的影响情况。 比如:两类地区A和B,在2020年A类地区没有开通高铁,B类地区没有开通。那么开通高铁对于GDP的影响情况如何呢? 涉及两个关键数据...
双重差分模型幻灯片+-+difference+in+differences+models
1、1Difference in Difference ModelsBill EvansSpring 20082Difference in difference models Maybe the most popular identification strategy in applied work today Attempts to mimic random assignment with treatment and “comparison” sample Application of two-way fixed effects model 3Problem set up Cross-sec...
•Basictwo-wayfixedeffectsmodel –Crosssectionandtimefixedeffects •Usetimeseriesofuntreatedgrouptoestablishwhatwouldhaveoccurredintheabsenceoftheintervention•Keyconcept:cancontrolforthefactthattheinterventionismorelikelyinsometypesofstates 6 Threedifferentpresentations •Tabular•Graphical•Regressionequation ...
双重差分模型幻灯片+-+difference+in+differences+models.ppt,Difference in Difference Models Bill Evans Spring 2008 Difference in difference models Maybe the most popular identification strategy in applied work today Attempts to mimic random assignment with
•Basictwo-wayfixedeffectsmodel –Crosssectionandtimefixedeffects •Usetimeseriesofuntreatedgrouptoestablishwhatwouldhaveoccurredintheabsenceoftheintervention •Keyconcept:cancontrolforthefactthattheinterventionismorelikelyinsometypesofstates 6 Threedifferentpresentations •Tabular•Graphical•Regressionequation...
Difference in differences regression Number of obs = 7,368 Data type: Repeated cross-sectional (Std. err. adjusted for 46 clusters in hospital) Robust staisCoefficient std. err. t P>|t| [95% conf. interval] ATET procedure (New vs
•Basictwo-wayfixedeffectsmodel –Crosssectionandtimefixedeffects •Usetimeseriesofuntreatedgrouptoestablishwhatwouldhaveoccurredintheabsenceoftheintervention •Keyconcept:cancontrolforthefactthattheinterventionismorelikelyinsometypesofstates 6 Threedifferentpresentations •Tabular•Graphical•Regressionequation...
•Basictwo-wayfixedeffectsmodel –Crosssectionandtimefixedeffects •Usetimeseriesofuntreatedgrouptoestablishwhatwouldhaveoccurredintheabsenceoftheintervention •Keyconcept:cancontrolforthefactthattheinterventionismorelikelyinsometypesofstates 6 Threedifferentpresentations •Tabular•Graphical•Regressionequation...
differencemodelsdifferences双重模型intervention DifferenceinDifference Models BillEvans Spring2008 1 Differenceindifferencemodels •Maybethemostpopularidentification strategyinappliedworktoday •Attemptstomimicrandomassignment withtreatmentand“comparison”sample •Applicationoftwo-wayfixedeffectsmodel 2 Problemsetup ...