christidis.wheat.uniformity.Rd
Uniformity trial of wheat at Cambridge, UK in 1931.
data("christidis.wheat.uniformity")
A data frame with 288 observations on the following 3 variables.
row
row
col
column
yield
yield
Two blocks, 24 rows each. In block A, each 90-foot row was divided into 12 units, each unit 7.5 feet long. Rows were 8 inches wide.
Field width: 12 units * 7.5 feet = 90 feet
Field length: 24 rows * 8 inches = 16 feet
Christidis, Basil G (1931). The importance of the shape of plots in field experimentation. The Journal of Agricultural Science, 21, 14-37. Table VI, p. 28. https://dx.doi.org/10.1017/S0021859600007942
None
# \dontrun{ library(agridat) data(christidis.wheat.uniformity) dat <- christidis.wheat.uniformity # sum(dat$yield) # Matches Christidis libs(desplot) desplot(dat, yield ~ col*row, flip=TRUE, aspect=16/90, # true aspect main="christidis.wheat.uniformity")# }