The model, Yᵢⱼ = μ₁ + β₁Iⱼ + δᵢⱼ, defines stability parameters that may be used to describe the performance of a variety over a series of environments. Yᵢⱼ is the variety mean of the iᵗʰ variety at the jₜₕ environment, µ₁ is the iᵗʰ variety mean over all environments, β₁ is the regression coefficient that measures the response of the iᵗʰ variety to varying environments, δᵢⱼ is the deviation from regression of the iᵗʰ variety at the jᵗʰ environment, and Iⱼ is the environmental index. The data from two single-cross diallels and a set of 3-way crosses were examined to see whether genetic differences could be detected. Genetic differences among lines were indicated for the regression of the lines on the environmental index with no evidence of nonadditive gene action. The estimates of the squared deviations from regression for many hybrids were near zero, whereas extremely large estimates were obtained for other hybrids.
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