Tests for unbalanced error-components models under local misspecification

Walter Sosa-Escudero, Anil K. Bera

Research output: Contribution to journalArticlepeer-review


This paper derives unbalanced versions of the test statistics for first-order serial correlation and random individual effects summarized in Sosa-Escudero and Bera (2001, Stata Technical Bulletin Reprints, vol. 10, pp. 307-311), and updates their xttest1 routine. The derived test statistics should be useful for applied researchers faced with the increasing availability of panel information where not every individual or country is observed for the full time span. The test statistics proposed here are based on ordinary least-squares residuals and hence are computationally very simple.

Original languageEnglish (US)
Pages (from-to)68-78
Number of pages11
JournalStata Journal
Issue number1
StatePublished - 2008


  • Error-components model
  • Misspecification
  • Sg164_1
  • Testing
  • Unbalanced panel data
  • Xttest1

ASJC Scopus subject areas

  • Mathematics (miscellaneous)


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