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South African Journal of Economic and Management Sciences

versión On-line ISSN 2222-3436
versión impresa ISSN 1015-8812

S. Afr. j. econ. manag. sci. vol.11 no.4 Pretoria dic. 2008

 

ARTICLES

 

Companies' investment determinants: Comparison of different panel data estimators1

 

 

Zelia SerrasqueiroI; Silvia MendesII; Paulo Maçãs NunesIII

IDepartamento de Gestão e Economia, Universidade da Beira Interior, Portugal and CEFAGE (Centro de Estudos e Formação Avançada em Gestão e Economia), Universidade de Évora
IIEscola Superior de Tecnologia e Gestão de Oliveira do Hospital, Instituto Politécnico de Coimbra, Portugal
IIIDepartamento de Gestão e Economia, Universidade da Beira Interior, Portugal

 

 


ABSTRACT

In this study, Aivazian, Ge and Qiu's (2005) analysis using static panel models is extended to using dynamic panel estimators, considering data for listed Portuguese companies. The results confirm Aivazian et al.'s (2005) conclusion that an Ordinary Least Squares (OLS) regression is not the best way to estimate the investment/determinant relationship. Investment decisions are probably dynamic, so the most suitable way to estimate the investment/determinant(s) relationship is using dynamic panel estimators. Alternatively a fixed effect panel model can be used, consistent with a first order autocorrelation. In this way, firstly, it is possible to determine more accurately the positive impact of sales (Neo-classic theory) and cash flow (Free Cash Flow theory) on the investments of listed Portuguese companies. Secondly, the positive effect of growth opportunities (Agency theory) is not overestimated when it seems to be the consequence of a first order autocorrelation. Using dynamic panel estimators permits correct measurement of dynamism in company investment decisions by examining the relationship between investment in the previous and the current periods.

Keywords: Dynamic Panel Estimators; Investment; Static Panel Models

JEL: C23, G31, G32


 

 

“Full text available only in PDF format”

 

 

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1 The LM test has a x2 distribution and tests the null hypothesis that non-observable individual effects are not relevant in explaining the dependent variable against the alternative hypothesis of relevance of non-observable individual effects in explaining the dependent variable.

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