christidis.wheat.uniformity: Uniformity trial of wheat

Description Usage Format Details Source References Examples

Description

Uniformity trial of wheat at Cambridge, UK in 1931.

Usage

1
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. http://dx.doi.org/10.1017/S0021859600007942

References

None

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
## Not run: 
  
  data(christidis.wheat.uniformity)
  dat <- christidis.wheat.uniformity
  
  # sum(dat$yield) # Matches Christidis
  
  require(desplot)
  desplot(yield ~  col*row, data=dat,
          flip=TRUE, aspect=16/90, # true aspect
          main="christidis.wheat.uniformity")


## End(Not run)

agridat documentation built on May 2, 2019, 4:01 p.m.