gge2003 {bpca}

A didactic matrix of genotypes (rows) and environments (columns)

Description

A didatic matrix of genotypes (rows) and environments (columns) proposed by Weikai Yan and Manjit S. Kang in GGE biplot analysis: a graphical tool for breeders, geneticists, and agronomists.

Usage

  data(gge2003)

Format

The format is: ⁠ num [1:4, 1:3] 20 6 -10 8 -9 12 -6 -12 6 -15 ... - attr(*, "dimnames")=List of 2 ..$ : chr [1:4] "G1" "G2" "G3" "G4" ..$ : chr [1:3] "E1" "E2" "E3" ⁠

References

Yan, B. W. and Kang, M. S. (2003) GGE biplot analysis : a graphical tool for breeders, geneticists, and agronomists. CRC Press, New York, 288p.

Examples

##
## Example from YAN, W & KANG, M.S. GGE biplot analysis : a graphical tool
## for breeders, geneticists, and agronomists
##

data(gge2003)
bp <- bpca(t(gge2003), var.rb=TRUE)

as.dist(bp$var.rb)

dev.new(w=8, h=4)
op = par(no.readonly=TRUE)
par(mfrow=c(1,2))

plot(bpca(gge2003, var.pos=2),
     main='Columns as variables \n (var.pos=2)',
     var.col=1,
     obj.col=c(2:4, 2), obj.cex=.8)

plot(bpca(gge2003, var.pos=1),
     main='Rows as variables \n (var.pos=1)',
     var.col=1,
     obj.col=2:4, obj.cex=.8)

par(op)