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Title:Instrumental variables in models with multiple outcomes: the general unordered case PDF Logo
Authors:Heckman, James Joseph
Urzúa, Sergio
Vytlacil, Edward
Issue Date:2008
Series/Report no.:IZA Discussion Papers 3565
Abstract:This paper develops the method of local instrumental variables for models with multiple, unordered treatments when treatment choice is determined by a nonparametric version of the multinomial choice model. Responses to interventions are permitted to be heterogeneous in a general way and agents are allowed to select a treatment (e.g., participate in a program) with at least partial knowledge of the idiosyncratic response to the treatments. We define treatment effects in a general model with multiple treatments as differences in counterfactual outcomes that would have been observed if the agent faced different choice sets. We show how versions of local instrumental variables can identify the corresponding treatment parameters. Direct application of local instrumental variables identifies the marginal treatment effect of one option versus the next best alternative without requiring knowledge of any structural parameters from the choice equation or any large support assumptions. Using local instrumental variables to identify other treatment parameters requires either large support assumptions or knowledge of the latent index function of the multinomial choice model.
Subjects:Nonparametric
multinomial
treatment effects
JEL:C31
Persistent Identifier of the first edition:urn:nbn:de:101:1-2008070206
Document Type:Working Paper
Appears in Collections:IZA Discussion Papers, Forschungsinstitut zur Zukunft der Arbeit (IZA)

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