agridat (version 1.12)

mead.strawberry: Strawberry yields in RCB experiment

Description

Strawberry yields in RCB experiment

Format

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

row

Row

col

Column

block

Block factor, 4 levels

gen

Genotype factor, 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

# NOT RUN {
data(mead.strawberry)
dat <- mead.strawberry
dat$sub <- ifelse(is.element(dat$gen, c('G', 'V', 'R1', 'F')),
              "S1","S2")
desplot(yield~col*row, dat, text=gen, cex=1, out1=block, out2=sub,
        main="mead.strawberry")

# }