mead.strawberry {agridat} | R Documentation

## 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, 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.

### Source

Unknown, but prior to 1968 according to Besag. Probably via R. Mead.

### 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

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

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

[Package agridat version 1.16 Index]