Journal of Agricultural, Biological, and Environmental Statistics

, 14:392

Enhanced diagnostics for the spatial analysis of field trials


    • Department of Agriculture and Food WA
  • Alison B. Smith
    • NSWDPI Wagga Wagga Agricultural Institute
  • Brian R. Cullis
    • NSWDPI Wagga Wagga Agricultural Institute

DOI: 10.1198/jabes.2009.07098

Cite this article as:
Stefanova, K.T., Smith, A.B. & Cullis, B.R. JABES (2009) 14: 392. doi:10.1198/jabes.2009.07098


We report an analysis of a series of uniformity field trials using the technique proposed by Gilmour, Cullis, and Verbyla. In particular, we clarify the role of the sample variogram and present a range of enhanced graphical diagnostics to aid the spatial modeling process. We highlight the implications of the presence of extraneous variation related to commonly used agronomic practices, such as serpentine harvesting.

Key words

Agronomic practiceCoverage intervalMixed modelResidual maximum likelihoodSpatial modelingVariogram

Copyright information

© International Biometric Society 2009