mercer.mangold.uniformity.Rd
Uniformity trial of mangolds at Rothamsted Experiment Station, England, 1910.
data("mercer.mangold.uniformity")
A data frame with 200 observations on the following 4 variables.
row
row
col
column
roots
root yields, pounds
leaves
leaf yields, pounds
Grown in 1910.
Each plot was 3 drills, each drill being 2.4 feet wide. Plots were 1/200 acres, 7.2 feet by 30.25 feet long The "length of the plots runs with the horizontal lines of figures [in Table I], this being also the direction of the drills across the field."
Field width: 10 plots * 30.25ft = 302.5 feet
Field length: 20 plots * 7.25 ft = 145 feet
Mercer, WB and Hall, AD, 1911. The experimental error of field trials The Journal of Agricultural Science, 4, 107-132. Table 1. https://doi.org/10.1017/S002185960000160X
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. https://doi.org/10.1098/rspa.2006.1667
# \dontrun{ library(agridat) data(mercer.mangold.uniformity) dat <- mercer.mangold.uniformity libs(desplot) desplot(dat, leaves~col*row, aspect=145/302, # true aspect main="mercer.mangold.uniformity - leaves")libs(desplot) desplot(dat, roots~col*row, aspect=145/302, # true aspect main="mercer.mangold.uniformity - roots")# }