doBy (version 4.6-2)

data-beets: 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, S<U+00F8>ren H<U+00F8>jsgaard (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

# NOT RUN {
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))

# }