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The relationship between stability-variance parameter estimate ( σi2) and ecovalence ( Wisum of squares) was examined. It was found that Σj (uij − ūj.)2 In the formula for calculating σi2 is equal to Wi sum of squares and that σi2 is a coded value of Wi. A new formula for σi2, encompassing Wi, is given. The σi2 and si2 (derived from σi2 by removing heterogeneity from genotype × environment interaction) statistics should be used in preference to Wi in genotype × environment interaction or stability analysis studies.
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Kang et al. (1987) studied this question.
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