Inappropriate application of logarithmic transformations for allometric power functions of morphometric data on acanthocephalan worms

Authors

  • Maarten J. Voordouw

    Corresponding author
    1. Department of Biology, University of Victoria, Victoria, BC, Canada
      All correspondence to: M. J. Voordouw, Department of Biology, University of Victoria, P.O. Box 3020, Victoria, BC V8W 3N5, Canada. E-mail: voordouw@uvic.ca
    Search for more papers by this author

All correspondence to: M. J. Voordouw, Department of Biology, University of Victoria, P.O. Box 3020, Victoria, BC V8W 3N5, Canada. E-mail: voordouw@uvic.ca

Abstract

Logarithmic transformation is used to transform multiplicative phenomena to a linear, additive scale. Some workers recommend the transformation x′= log x+ 1 when observed values are equal to zero. However, when working with morphometric data, this transformation is inappropriate because it arbitrarily changes the nature of the relationship between body parts. To illustrate this point, this contribution re-analyses a data set from the recent literature.

Ancillary