agridat (version 1.12)

talbot.potato: Potato yields and trait scores at 12 UK locations

Description

Yield and 14 trait scores for each of 9 potato varieties at 12 locations in UK.

Format

A list of two matrices, yield and char. See details below.

Details

The yield matrix contains mean tuber yields (t/ha) of 9 varieties of potato at 12 centers in the United Kingdom over five years 1983-1987. The following abbreviations are used for the centers.

BU	Bush
CA	Cambridge
CB	Conon Bridge
CC	Crossacreevy
CP	Cockle Park
CR	Craibstone
GR	Greenmount
HA	Harper Adams
MO	Morley
RO	Rosemaund
SB	Sutton Bonnington
TE	Terrington

The char matrix contains the scores of 14 traits on each of the 9 varities.

Examples

# NOT RUN {
data(talbot.potato)

if(require(pls)){

  char <- talbot.potato$char
  yield <- talbot.potato$yield

  # Transform columns to zero mean and unit variance
  char <- scale(char)
  yield <- scale(yield)

  m1 <- plsr(yield ~ char, ncomp=3)
  summary(m1)

  # Loadings factor 1
  lo <- loadings(m1)[,1,drop=FALSE]
  round(-1*lo[order(-1*lo),1,drop=FALSE],2)

  biplot(m1, main="talbot.potato - biplot")

}

# }