agridat (version 1.23)

talbot.potato: Multi-environment trial of potato in UK, yields and trait scores at 12 locations

Description

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

Usage

data("talbot.potato.traits")
data("talbot.potato.yield")

Format

The talbot.potato.yield dataframe has 126 observations on the following 3 variables.

gen

genotype/variety

trait

trait

score

trait score, 1-9

The talbot.potato.yield dataframe has 108 observations on the following 3 variables.

gen

genotype/variety

loc

location/center

yield

yield, t/ha

Details

The talbot.potato.yield dataframe 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

Used with permission of Mike Talbot.

Examples

if (FALSE) {

library(agridat)

libs(pls, reshape2)

data(talbot.potato.traits)
datt <- talbot.potato.traits
data(talbot.potato.yield)
daty <- talbot.potato.yield

datt <- acast(datt, gen ~ trait, value.var='score')
daty <- acast(daty, gen ~ loc, value.var='yield')  

# Transform columns to zero mean and unit variance
datt <- scale(datt)
daty <- scale(daty)

m1 <- plsr(daty ~ datt, 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")

}