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Published online 1 March 1995
Published in Agron J 87:276-277 (1995)
© 1995 American Society of Agronomy
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STABLE: A BASIC Program for Calculating Stability and Yield-Stability Statistics

Manjit S. Kang* and Robert Magari

Dep. of Agronomy, Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Ctr., Baton Rouge, LA 70803-2110

* Corresponding author.

There is a worldwide interest among plant breeders, geneticists, and production agronomists in genotype x environment (GE) interaction. A stability analysis is often conducted to estimate and interpret GE interaction. From a practical standpoint, stability statistics and genotype performance (yield) need to be integrated. A DOS-version computer program (STABLE) was developed that calculates Shukla's stability-variance statistic ({sigma}2i) and Kang's yield-stability statistic (YSi) that combines yield and stability of performance into a single selection criterion. STABLE operates on IBM-PCs or compatible microcomputers with a BASIC, GWBASIC, or QBASIC interpreter. Input of data and other information is menu-driven. Output consists of (i) a table showing analysis of variance, (ii) a table showing genotype means, {sigma}2i, s2i (a stability-variance statistic computed from residual GE interaction after removal of heterogeneity due to a covariate), and Wricke's ecovalence (Wi), and (iii) a table showing various statistics and information, such as {sigma}2i, YSi, and genotypes selected on the basis of YSi. This program should be useful for selecting high-yielding, stable genotypes.

Approved for publication by the director of the Louisiana Agric. Exp. Sin. as Manuscript no, 94-09-8192.

Received for publication March 5, 1994.


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