R: beets data

beets {doBy} | R Documentation

## beets data

### Description

Yield and sugar percentage in sugar beets from a split plot experiment. Data is obtained from a split plot experiment. There are 3 blocks and in each of these the harvest time defines the "whole plot" and the sowing time defines the "split plot". Each plot was 25 m^2 and the yield is recorded in kg. See 'details' for the experimental layout.

### Usage

    beets

### Format

The format is: chr "beets"

### Details

    Experimental plan
    Sowing times            1        4. april
                            2       12. april
                            3       21. april
                            4       29. april
                            5       18. may
    Harvest times           1        2. october
                            2       21. october
    Plot allocation:
                   Block 1     Block 2     Block 3
                +-----------|-----------|-----------+
          Plot  | 1 1 1 1 1 | 2 2 2 2 2 | 1 1 1 1 1 | Harvest time
           1-15 | 3 4 5 2 1 | 3 2 4 5 1 | 5 2 3 4 1 | Sowing time
                |-----------|-----------|-----------|
          Plot  | 2 2 2 2 2 | 1 1 1 1 1 | 2 2 2 2 2 | Harvest time
          16-30 | 2 1 5 4 3 | 4 1 3 2 5 | 1 4 3 2 5 | Sowing time
                +-----------|-----------|-----------+

### References

Ulrich Halekoh, Søren Højsgaard (2014)., A Kenward-Roger Approximation and Parametric Bootstrap Methods for Tests in Linear Mixed Models - The R Package pbkrtest., Journal of Statistical Software, 58(10), 1-30., http://www.jstatsoft.org/v59/i09/

### Examples

    data(beets)

    beets$bh <- with(beets, interaction(block, harvest))
    summary(aov(yield ~ block + sow + harvest + Error(bh), beets))
    summary(aov(sugpct ~ block + sow + harvest + Error(bh), beets))

[Package doBy version 4.6.5 Index]