agridat (version 1.23)

mcclelland.corn.uniformity: Uniformity trial of corn

Description

Uniformity trial of corn at Arkansas Experiment Station, 1925.

Usage

data("mcclelland.corn.uniformity")

Format

A data frame with 438 observations on the following 3 variables.

row

row

col

column

yield

yield

Details

A uniformity trial of corn in 1925 at the Arkansas Experimental Station. Unit of measure not given.

Field width = 66ft * 2 = 132 feet.

Field length = 219 rows * 44 inches / 12 inches/ft = 803 ft.

Note: In the source document, table 2, first 'west' column and second-to-last row (page 822), the value 1.40 is assumed to be a typographical error and was changed to 14.0 for this data.

References

None

Examples

if (FALSE) {

library(agridat)

  data(mcclelland.corn.uniformity)
  dat <- mcclelland.corn.uniformity
  
  # McClelland table 3, first row, gives 11.2
  # Probable error = 0.67449 * sd(). Relative to mean.
  # 0.67449 * sd(dat$yield)/mean(dat$yield) # 11.2
  
  libs(desplot)
  desplot(dat, yield ~ col*row,
          flip=TRUE,
          aspect=(219*44/12)/132, # true aspect, 219 rows * 44 inches x 132 feet
          main="mcclelland.corn.uniformity")
  
}