eden.tea.uniformity {agridat} | R Documentation

## 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

### Source

T. Eden. (1931). Studies in the yield of tea. 1. The experimental errors of field experiments with tea. Agricultural Science, 21, 547-573. https://doi.org/10.1017/S0021859600088511

### 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")

    ## End(Not run)

[Package agridat version 1.16 Index]