EconPapers    
Economics at your fingertips  
 

DIFFERENCE IN DIFFERENCES FOR STAYERS WITH A TIME‐VARYING QUALIFICATION: HEALTH EXPENDITURE ELASTICITY OF THE ELDERLY

Myoung-jae Lee and Young‐Sook Kim

Health Economics, 2014, vol. 23, issue 9, 1134-1145

Abstract: In difference in differences, a treatment is applied only to a qualified group at some time point. The qualification may be time‐constant as in gender, or time‐varying as in residential location. When the qualification is time‐varying, there appear four groups: the newly qualified (in‐movers), the already qualified (in‐stayers), the newly disqualified (out‐movers), and the already disqualified (out‐stayers). A change in qualification may affect the response variable of interest even when the treatment effect is zero, which is an ‘untreated moving effect’. Also, when the treatment effect is not zero, it may be different across the four groups. The conventional difference in differences fails to remove untreated moving effects and ignores the possible treatment effect heterogeneity across the groups. This paper shows how to account for untreated moving effects and proposes ‘the effect on in‐stayers’ as the main effect of interest. Our proposal can be implemented with least squares estimator for panel models or with nonparametric methods. An empirical analysis is provided using Korean data for the effects of the basic elder pension on health‐care expenditure. Copyright © 2014 John Wiley & Sons, Ltd.

Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: Track citations by RSS feed

Downloads: (external link)
https://doi.org/10.1002/hec.3049

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wly:hlthec:v:23:y:2014:i:9:p:1134-1145

Access Statistics for this article

Health Economics is currently edited by Alan Maynard, John Hutton and Andrew Jones

More articles in Health Economics from John Wiley & Sons, Ltd.
Bibliographic data for series maintained by Wiley Content Delivery ().

 
Page updated 2020-07-05
Handle: RePEc:wly:hlthec:v:23:y:2014:i:9:p:1134-1145