Tackling the omitted variables problem without the strong assumptions of proxies

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Omitted variables that interact with included independent variables change the vertical placement of observations. Thus, by projecting the data to an output oriented VRS DEA frontier, the influence of omitted variables can be eliminated. After this is done once, the efficient observations can be eliminated and the process repeated. Each subsequent iteration shows the relationship between the dependant and known independent variable for progressively less favorable omitted variables. Building on these ideas, we introduce a new analytical technique named "Reiterative Truncated Projected Least Squares" (RTPLS). We provide both a theoretical argument and simulation evidence that RTPLS produces less bias than ordinary least squares (OLS) when there are omitted variables that interact with the included variables. By way of example, we show how omitted variables have affected the relationship between the monetary base (MB) and the money supply (M2 + CDs) for Japan using monthly data from January 1970 to April 2003.

Original languageEnglish (US)
Pages (from-to)819-840
Number of pages22
JournalEuropean Journal of Operational Research
Volume178
Issue number3
DOIs
StatePublished - May 1 2007

Fingerprint

Least Squares
Ordinary Least Squares
Omitted variables
Japan
Placement
Vertical
Iteration
Output
Least squares
Simulation
Observation
Relationships
Analytical techniques
Monetary base
Ordinary least squares
Money supply
Money
Influence
Evidence

Keywords

  • Data envelopment analysis
  • Monetary policy
  • Omitted variables

ASJC Scopus subject areas

  • Modeling and Simulation
  • Management Science and Operations Research
  • Information Systems and Management

Cite this

Tackling the omitted variables problem without the strong assumptions of proxies. / Leightner, Jonathan E; Inoue, Tomoo.

In: European Journal of Operational Research, Vol. 178, No. 3, 01.05.2007, p. 819-840.

Research output: Contribution to journalArticle

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