denis.ryegrass {agridat} | R Documentation

## Multi-environment trial of perennial ryegrass in France

### Description

Plant strength of perennial ryegrass in France for 21 genotypes at 7 locations.

### Format

A data frame with 147 observations on the following 3 variables.

`gen`

  genotype, 21 levels

`loc`

  location, 7 levels

`strength`

  average plant strength * 100

### Details

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).

### Source

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

### References

Gower, J.C. and Hand, D.J., 1996. Biplots. Chapman and Hall.

### Examples

    ## Not run:

    library(agridat)
    data(denis.ryegrass)
    dat <- denis.ryegrass

    # biplots (without ellipses) similar to Denis figure 1
    require(gge)
    m1 <- gge(strength ~ gen*loc, dat, scale=FALSE)
    biplot(m1, main="denis.ryegrass biplot")

    ## End(Not run)

[Package agridat version 1.16 Index]