yan.winterwheat {agridat} | R Documentation

## Multi-environment trial of winter wheat in Ontario

### Description

Yield of 18 varieties of winter wheat grown at 9 environments in Ontario in 1993.

### Format

A data frame with 162 observations on the following 3 variables.

`gen`

  genotype

`env`

  environment

`yield`

  yield in metric tons per hectare

### Details

The yield is the mean of several reps, measured in metric tons per hectare.

This data has often been used to illustrate GGE biplots.

### Source

Weikai Yan and M.S. Kang. GGE biplot analysis: A graphical tool for breeders, geneticists, and agronomists, 2002. CRC. Page 59.

Weikai Yan and Nicholas A. Tinker. 2006. Biplot analysis of multi-environment trial data: Principles and applications. Table 1.

Used with permission of Weikai Yan.

### References

Weikai Yan and Manjit S. Kang and Baoluo Ma and Sheila Woods, 2007, GGE Biplot vs. AMMI Analysis of Genotype-by-Environment Data, Crop Science, 2007, 47, 641–653. http://doi.org/10.2135/cropsci2006.06.0374

### Examples

    ## Not run:

    data(yan.winterwheat)
    dat <- yan.winterwheat

    require(gge)
    m1 <- gge(yield ~ gen*env, data=dat)
    biplot(m1, flip=c(1,1), hull=TRUE,
           main="yan.winterwheat - GGE biplot")

    ## End(Not run)

[Package agridat version 1.16 Index]