christidis.wheat.uniformity {agridat}

Uniformity trial of wheat

Description

Uniformity trial of wheat at Cambridge, UK in 1931.

Usage

data("christidis.wheat.uniformity")

Format

A data frame with 288 observations on the following 3 variables.

row

row

col

column

yield

yield

Details

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

Source

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

References

None

Examples

## 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)