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Testing for heteroskedasticity and spatial correlation in a two way random effects model

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  • Kouassi, Eugene
  • Mougoué, Mbodja
  • Sango, Joel
  • Bosson Brou, J.M.
  • Amba, Claude M.O.
  • Salisu, Afeez Adebare

Abstract

An extension of the Holly and Gardiol (2000) and Baltagi et al. (2009) papers to the two way context, with heteroskedastic and spatially correlated disturbances is considered. One then derives a joint LM test for homoskedasticity and no spatial correlation. In addition, two conditional LM tests are also derived: for no spatial correlation given heteroskedasticity and for homoskedasticity given spatial correlation respectively. These tests are compared with marginal ones that ignore heteroskedasticity in testing for spatial correlation, or spatial correlation in testing for homoskedasticity. Monte Carlo results show that the LM and LR tests perform well even for small N and T whereas their Wald counterparts tend to oversize. An application on the demand for cigarettes is also conducted. The misleading inference can occur when using marginal rather than joint or conditional LM tests when spatial correlation or heteroskedasticity is present.

Suggested Citation

  • Kouassi, Eugene & Mougoué, Mbodja & Sango, Joel & Bosson Brou, J.M. & Amba, Claude M.O. & Salisu, Afeez Adebare, 2014. "Testing for heteroskedasticity and spatial correlation in a two way random effects model," Computational Statistics & Data Analysis, Elsevier, vol. 70(C), pages 153-171.
    • Handle: RePEc:eee:csdana:v:70:y:2014:i:c:p:153-171
    DOI: 10.1016/j.csda.2013.09.003
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