agridat (version 1.23)

besag.checks: Check variety yields in winter wheat.

Description

Check variety yields in winter wheat.

Usage

data("besag.checks")

Format

A data frame with 364 observations on the following 4 variables.

yield

yield, units of 10g

row

row

col

column

gen

genotype/variety

Details

This data was used by Besag to show the spatial variation in a field experiment, but Besag did not use the data for any analysis.

Yields of winter wheat varieties (Bounty and Huntsman) at the Plant Breeding Institute, Cambridge, in 1980. These data are the 'checks' genotypes in a larger variety trial.

There is a column of checks, then five columns of new varieties. Repeat.

Plot dimensions approx 1.5 by 4.5 metres

Field length: 52 rows * 4.5 m = 234 m

Field width: 31 columns * 1.5 m = 46.5

Electronic version of data supplied by David Clifford.

References

Kempton, Statistical Methods for Plant Variety Evaluation, page 91--92

Examples

if (FALSE) {
library(agridat)
data(besag.checks)
dat <- besag.checks
  libs(desplot)
  desplot(dat, yield~col*row,
          num=gen, aspect=234/46.5, # true aspect
          main="besag.checks")
}