agridat (version 1.23)

mead.strawberry: RCB experiment of strawberry

Description

RCB experiment of strawberry

Format

A data frame with 32 observations on the following 5 variables.

row

row

col

column

block

block, 4 levels

gen

genotype, 8 levels

yield

yield, pounds

Details

A hedge along the right side (column 8) caused shading and lower yields.

R. Mead said (in a discussion of the Besag & Higdon paper), "the blocks defined (as given to me by the experimenter) are the entire horizontal rows...the design of the trial is actually (and unrecognized by me also) a checker-board of eight half-blocks with two groups of split-plot varieties".

The two sub-groups of genotypes are G, V, R1, F and Re, M, E, P.

References

R. Mead, 1990, The Design of Experiments.

Julian Besag and D Higdon, 1999. Bayesian Analysis of Agricultural Field Experiments, Journal of the Royal Statistical Society: Series B (Statistical Methodology),61, 691--746. Table 4.

Examples

if (FALSE) {

library(agridat)
data(mead.strawberry)
dat <- mead.strawberry
dat$sub <- ifelse(is.element(dat$gen, c('G', 'V', 'R1', 'F')),
              "S1","S2")

libs(desplot)
desplot(dat, yield~col*row,
        text=gen, cex=1, out1=block, out2=sub, # unknown aspect
        main="mead.strawberry")

}