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Costing Adult Attention Deficit Hyperactivity DisorderImpact on the Individual and Society$
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David Daley, Rasmus Højbjerg Jacobsen, Anne-Mette Lange, Anders Sørensen, and Jeanette Walldorf

Print publication date: 2015

Print ISBN-13: 9780198745556

Published to Oxford Scholarship Online: September 2015

DOI: 10.1093/acprof:oso/9780198745556.001.0001

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Methodology and Econometric Challenges

Methodology and Econometric Challenges

Chapter:
(p.109) 6 Methodology and Econometric Challenges
Source:
Costing Adult Attention Deficit Hyperactivity Disorder
Author(s):

David Daley

Rasmus Højbjerg Jacobsen

Anne‐Mette Lange

Anders Sørensen

Jeanette Walldorf

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198745556.003.0006

In this chapter, a non-technical explanation of the empirical approach to assess the differences between individuals with ADHD and non-ADHD individuals is presented. The applied methodology is propensity score matching and the task of selecting a matched control group similar to the treatment group with respect to various observable aspects is described. Relevant methodological issues are discussed, especially the challenges associated with unobservable heterogeneity. This aspect is addressed by comparing the treatment group of individuals with ADHD with their siblings without ADHD to compare individuals who have been raised in shared environments. The advantage of using sibling-based control groups is that siblings are similar with respect to many of the characteristics that are difficult to observe. In this sense, the concern that unobserved differences play an important role in determining the observed differences between the treatment and control groups is reduced.

Keywords:   propensity score matching, treatment group, control group, unobserved heterogeneity, sibling-based analysis

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