Uniformity trials of tea
Uniformity trials of tea
data("laycock.tea.uniformity")A data frame with 54 observations on the following 4 variables.
loclocation, L1 or L2
rowrow
colcolumn
yieldyield
Actual physical dimensions for the tea shrubs are not given, so we use
an estimate of four feet square for each shrub (which is similar to
the eden.tea.uniformity experiment).
Location 1 (Laycock, page 108) is at the Research Station, Nyasaland. Plots were 10 by 15 bushes, harvested 23 times in 1942.
Field length: 8 plots * 10 bushes * 4 feet = 320 feet.
Field width: 4 plots * 15 bushes * 4 feet = 240 feet.
Location 2 (Laycock page 110) is at Mianga Estate, Nyasaland. Plots were 9 by 11 bushes, harvested 18 times in 1951/52.
Field length: 9 plots * 9 bushes * 4 feet = 324 feet.
Field width: 6 plots * 11 bushes * 4 feet = 264 feet.
Laycock, D. H. (1955). The effect of plot shape in reducing the errors of tea experiments. Tropical Agriculture, 32, 107-114.
Zimmerman, Dale L., and David A. Harville. (1991). A random field approach to the analysis of field-plot experiments and other spatial experiments. Biometrics, 47, 223-239.
## Not run:
library(agridat)
data(laycock.tea.uniformity)
dat <- laycock.tea.uniformity
libs(desplot)
desplot(dat, yield ~ col*row|loc,
flip=TRUE, aspect=322/252, # average of 2 locs
main="laycock.tea.uniformity")
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.