Journal of Paleolimnology

, Volume 10, Issue 2, pp 147–152

WACALIB version 3.3 — a computer program to reconstruct environmental variables from fossil assemblages by weighted averaging and to derive sample-specific errors of prediction


  • J. M. Line
    • University of Cambridge Computer Laboratory
  • Cajo J. F. ter Braak
    • Agricultural Mathematics Group-DLO
    • DLO-Institute for Forestry and Nature Research
  • H. J. B. Birks
    • Botanical InstituteUniversity of Bergen
    • Environmental Research CentreUniversity College London

DOI: 10.1007/BF00682511

Cite this article as:
Line, J.M., ter Braak, C.J.F. & Birks, H.J.B. J Paleolimnol (1994) 10: 147. doi:10.1007/BF00682511


A computer program for reconstructing environmental variables (e.g. lake-water pH) from fossil assemblages (e.g. diatoms) by weighted averaging regression and calibration is described. The estimation of sample-specific errors of prediction by bootstrapping is outlined. The program runs on IBM-compatible personal computers.

Key words

weighted averagingregressioncalibrationbootstrappingmaximum likelihoodreconstructionerror estimation

Copyright information

© Kluwer Academic Publishers 1994