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Interactions in Regressions

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Author Info
J. Hirschberg
J. Lye

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Abstract

Regression specifications frequently employ regressors that are defined as the product of two other regressors to form an interaction. Unfortunately, these models have a number of potential difficulties when it comes to interpretation. In this paper, we discuss two common aspects of these specifications that can lead to difficulties. The first is the change in parameter estimates and tstatistics when different definitions of dummy variables are used. The second involves an application of Fieller’s theorem to draw appropriate inferences from a regression with interaction variables.

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File URL: http://www.economics.unimelb.edu.au/SITE/research/workingpapers/wp05/952.pdf
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Publisher Info
Paper provided by The University of Melbourne in its series Department of Economics - Working Papers Series with number 952.

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Length: 13 pages
Date of creation: 2005
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Handle: RePEc:mlb:wpaper:952

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Related research
Keywords: Interaction effects dummy variables linear transformation Fieller method

Find related papers by JEL classification:
C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: General - - - Hypothesis Testing
C51 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Construction and Estimation

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This page was last updated on 2008-11-16.

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