, Volume 42, Issue 1, pp 119–125

Pyrrho's lemma, or have it your way

  • Theo K. Dijkstra

DOI: 10.1007/BF01894292

Cite this article as:
Dijkstra, T.K. Metrika (1995) 42: 119. doi:10.1007/BF01894292


A simple lemma is derived to support the claim that regression models can be manipulated to a very large extent: by simply adding one regressor one can obtain essentially every set of desired regression coefficients and predictions as well ast-values and standard errors. Consequently, if the product of a specification search is not shown to be generalizable, a sceptical attitude towards its validity is well-founded.

Copyright information

© Physica-Verlag 1995

Authors and Affiliations

  • Theo K. Dijkstra
    • 1
  1. 1.Faculty of EconomicsUniversity of GroningenGroningenThe Netherlands

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