agridat (version 1.16)

eden.tea.uniformity: Uniformity trial of tea

Description

Uniformity trial of tea in Ceylon.

Usage

data("eden.tea.uniformity")

Format

A data frame with 144 observations on the following 4 variables.

entry

entry number

yield

yield

row

row

col

column

Details

Tea plucking in Ceylon extended from 20 Apr 1928 to 10 Dec 1929. There were 42 pluckings.

The field was divided into 144 plots of 1/72 acre = 605 sq ft. Each plot contained 6 rows of bushes, approximately 42 bushes. (Each row was thus about 7 bushes).

Plots in row 12 were at high on a hillside, plots in row 1 were low on the hill.

Note: We will assume the plots are roughly square: 6 rows of 7 bushes.

Field width: 12 plots * 24.6 feet = 295 feet

Field length: 12 plots * 24.6 feet = 295 feet

References

None

Examples

# NOT RUN {
  
  data(eden.tea.uniformity)
  dat <- eden.tea.uniformity
  
  # sum(dat$yield) # 140050.6 matches total yield in appendix A
  # mean(dat$yield) # 972.574 match page 5554
  
  m1 <- aov(yield ~ factor(entry) + factor(row) + factor(col), data=dat)
  summary(m1)
  
  require(desplot)
  desplot(yield ~ col*row, dat,
          aspect=1,
          main="eden.tea.uniformity")
  
# }