MISSING OBSERVATIONS IN THE ANALYSIS OF STABILITY

In crop variety testing it is frequently of interest to estimate measu res of yielding stability or phenotypic stability. The common procedur es for stability analysis require a balanced two-way table of genotype s and environments, in which all cells are filled. Frequently, however , empirical data sets are unbalanced due to missing observations. This paper explores methods to estimate stability when some cells are empt y. A set of wheat data is used to exemplify these methods.