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dc.contributor.authorDeLuna, Xavieren_US
dc.contributor.authorJohansson, Peren_US
dc.date.accessioned2012-07-10en_US
dc.date.accessioned2012-09-14T11:08:16Z-
dc.date.available2012-09-14T11:08:16Z-
dc.date.issued2012en_US
dc.identifier.urihttp://hdl.handle.net/10419/62585-
dc.description.abstractThe identification of average causal effects of a treatment in observational studies is typically based either on the unconfoundedness assumption or on the availability of an instrument. When available, instruments may also be used to test for the unconfoundedness assumption (exogeneity of the treatment). In this paper, we define variables which we call quasi-instruments because they allow us to test for the unconfoundedness assumption although they do not necessarily yield nonparametric identification of the average causal effect. A quasi-instrument is defined as an instrument except for that its relation to the treatment is allowed to be confounded by unobservables, thereby resulting in a wider range of potential applications. We propose a test for the unconfoundedness assumption based on a quasi-instrument, and give conditions under which the test has power. We perform a simulation study and apply the results to a case study where the interest lies in evaluating the effect of job practice on employment.en_US
dc.language.isoengen_US
dc.publisherIZA Bonnen_US
dc.relation.ispartofseriesDiscussion Paper series, Forschungsinstitut zur Zukunft der Arbeit 6692en_US
dc.subject.jelC26en_US
dc.subject.jelC52en_US
dc.subject.ddc330en_US
dc.subject.keywordtestingen_US
dc.subject.keywordendogeneityen_US
dc.subject.keywordmonotonicityen_US
dc.subject.keywordpotential outcomesen_US
dc.subject.stwWirkungsanalyseen_US
dc.subject.stwKausalanalyseen_US
dc.subject.stwNichtparametrisches Verfahrenen_US
dc.subject.stwStatistischer Testen_US
dc.subject.stwTheorieen_US
dc.subject.stwSimulationen_US
dc.subject.stwArbeitsmarktpolitiken_US
dc.subject.stwPraktikumen_US
dc.subject.stwSchwedenen_US
dc.titleTesting for nonparametric identification of causal effects in the presence of a quasi-instrumenten_US
dc.typeWorking Paperen_US
dc.identifier.ppn719148243en_US
dc.rightshttp://www.econstor.eu/dspace/Nutzungsbedingungenen_US
Appears in Collections:IZA Discussion Papers, Forschungsinstitut zur Zukunft der Arbeit (IZA)

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