agridat (version 1.12)

mercer.mangold.uniformity: Mercer and Hall's uniformity trial of mangolds in 1910

Description

Mercer and Hall's uniformity trial of mangolds in 1910

Usage

data(mercer.mangold.uniformity)

Format

A data frame with 200 observations on the following 4 variables.

roots

root yields, pounds

leaves

leaf yields, pounds

col

column, 1-10

row

row, 1-20

Details

Grown in 1910. Each plot was 3 "drills", each 2.4 feet wide. Plots were 1/200 acres, 7.2 feet by 30.25 feet long

References

McCullagh, P. and Clifford, D., (2006). Evidence for conformal invariance of crop yields, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science, 462, 2119--2143.

Examples

# NOT RUN {
data(mercer.mangold.uniformity)
dat <- mercer.mangold.uniformity

# Show field in true aspect ratio
asp = (7.25 * 20) / (30.25 * 10)

desplot(roots~col*row, data=dat,
        main="mercer.mangold.uniformity roots", aspect=asp)
desplot(leaves~col*row, data=dat,
        main="mercer.mangold.uniformity leaves", aspect=asp)

# xyplot(roots~leaves, data=dat)

# }