欢迎来到天天文库
浏览记录
ID:58216489
大小:58.50 KB
页数:12页
时间:2020-09-05
《《计量经济学导论》电子教案课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、SummaryandConclusionsCarryingOutanEmpiricalProject1Economics20-Prof.AndersonChoosingaTopicStartwithageneralareaorsetofquestionsMakesureyouareinterestedinthetopicUseon-lineservicessuchasEconLittoinvestigatepastworkonthistopicNarrowdownyourtopictoaspecificquestionorissuetobeinvestigatedWorkthroughthet
2、heoreticalissue2Economics20-Prof.AndersonChoosingDataWantdatathatincludesmeasuresofthethingsthatyourtheoreticalmodelimplyareimportantInvestigatewhattypeofdatasetshavebeenusedinthepastliteratureSearchforwhatotherdatasetsareavailable(forexample,ICPSR)Considercollectingyourowndata3Economics20-Prof.Ande
3、rsonUsingtheDataCreatevariablesappropriateforanalysisForexample,createdummyvariablesfromcategoricalvariables,createhourlywages,etc.Checkthedataformissingvalues,errors,outliers,etc.Recodeasnecessary,besuretoreportwhatyoudid4Economics20-Prof.AndersonEstimatingaModelStartwithamodelthatisclearlybasedint
4、heoryTestforsignificanceofothervariablesthataretheoreticallylessclearTestforfunctionalformmisspecificationConsiderreasonableinteractions,quadratics,logs,etc.5Economics20-Prof.AndersonEstimatingaModel(continued)Don’tlosesightoftheoryandtheceterisparibusinterpretation–youneedtobecarefulaboutincludingv
5、ariablesthatgreatlyaltertheinterpretationForexample,effectofbedroomsconditionalonsquarefootageBecarefulaboutputtingfunctionsofyontherighthandside–affectsinterpretation6Economics20-Prof.AndersonEstimatingaModel(continued)Onceyouhaveawell-specifiedmodel,needtoworryaboutthestandarderrorsTestforheterosk
6、edasticityCorrectifnecessaryTestforserialcorrelationifthereisatimecomponentCorrectifnecessary7Economics20-Prof.AndersonOtherProblemsOftenyouhavetoworryaboutendogeneityofthekeyexplanatoryvariableEndogeneitycouldarisefromomittedvariablesthatarenotobservedinthedataEndogeneitycouldarisebecausethemodelis
7、reallypartofasimultaneousequationEndogeneitycouldariseduetomeasurementerror8Economics20-Prof.AndersonOtherProblems(continued)Ifyouhavepaneldata,canconsiderafixedeffectsmodel(orfirstdifferences)Problem
此文档下载收益归作者所有