Statistics Papers

Document Type

Journal Article

Date of this Version

12-2012

Publication Source

Health Services and Outcomes Research Methodology

Volume

12

Issue

4

Start Page

237

Last Page

253

DOI

10.1007/s10742-012-0091-0

Abstract

Classic instrumental variable techniques involve the use of structural equation modeling or other forms of parameterized modeling. In this paper we use a nonparametric, matching-based instrumental variable methodology that is based on a study design approach. Similar to propensity score matching, though unlike classic instrumental variable approaches, near/far matching is capable of estimating causal effects when the outcome is not continuous. Unlike propensity score matching, though similar to instrumental variable techniques, near/far matching is also capable of estimating causal effects even when unmeasured covariates produce selection bias. We illustrate near/far matching by using Medicare data to compare the effectiveness of carotid arterial stents with cerebral protection versus carotid endarterectomy for the treatment of carotid stenosis.

Copyright/Permission Statement

The final publication is available at Springer via http://dx.doi.org/10.1007/s10742-012-0091-0.

Keywords

instrumental variables, matching, study design, binary outcomes, comparative effectiveness, medicare data

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Date Posted: 27 November 2017

This document has been peer reviewed.