English, Article, Journal or magazine article edition: INSTRUMENTAL VARIABLES IN MODELS WITH MULTIPLE OUTCOMES: THE GENERAL UNORDERED CASE James J. Heckman; Sergio Urzua; Edward Vytlacil

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Bookmark: http://trove.nla.gov.au/version/72679
Physical Description
  • preprint
Language
  • English

Edition details

Title
  • INSTRUMENTAL VARIABLES IN MODELS WITH MULTIPLE OUTCOMES: THE GENERAL UNORDERED CASE
Author
  • James J. Heckman
  • Sergio Urzua
  • Edward Vytlacil
Physical Description
  • preprint
Notes
  • This paper develops the method of local instrumental variables for mod- els 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 identies 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 ei- ther large support assumptions or knowledge of the latent index function of the multinomial choice model.
  • RePEc:ucd:wpaper:200830
Language
  • English
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