Plant strength of perennial ryegrass in France for 21 genotypes at 7 locations.
A data frame with 147 observations on the following 3 variables.
genotype, 21 levels
location, 7 levels
average plant strength * 100
INRA conducted a breeding trial in western France with 21 genotypes at 7 locations. The observed data is 'strength' averaged over 7-10 plants per plot and three plots per location (after adjusting for blocking effects). Each plant was scored on a scale 0-9.
The original data had a value of 86.0 for genotype G1 at location L4–this was replaced by an additive estimated value of 361.2 as in Gower and Hand (1996).
Jean-Baptiste Denis and John C. Gower, 1996. Asymptotic confidence regions for biadditive models: interpreting genotype-environment interaction, Applied Statistics, 45, 479-493. http://doi.org/10.2307/2986069
Gower, J.C. and Hand, D.J., 1996. Biplots. Chapman and Hall.
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