christidis.wheat.uniformity | R Documentation |
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
## Not run:
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")
## End(Not run)
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