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Agronomy Journal Abstract -

Analysis of a Randomized Block Design with Unequal Subclass Numbers


This article in AJ

  1. Vol. 89 No. 5, p. 718-723
    Received: Sept 8, 1995

    * Corresponding author(s): piepho@wiz.uni-kassel.de
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  1. Hans-Peter Piepho 
  1. Faculty of Agriculture, Univ. of Kassel, Steinstrasse 19, 37213 Witzenhausen, Germany



For some types of agricultural experiments, there are many observations per experimental unit; i.e., the subclass number is greater than one. In this article, the focus is on the randomized complete block design. Practitioners are often faced with unequal subclass numbers due to unpredicted experimental problems. The present paper discusses the statistical analysis of such unbalanced data, where subclass numbers vary independently of treatment variables and the response variable is not influenced by subclass number. In an example using the SAS statistical package to analyze data from a randomized complete block greenhouse experiment, an analysis of cell means compared favorably with a more elaborate Satterthwaite method. Monte Carlo simulations yielded similar results for both methods. It is concluded that, in practice, the cell means analysis is preferable for its simplicity.

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