Yield and sugar percentage in sugar beets from a split plot
experiment. The experimental layout was as follows: There were
three blocks. In each block, 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. The data originates from
a study carried out at The Danish Institute for Agricultural
Sciences (the institute does not exist any longer; it became
integrated in a Danish university).
Usage
beets
Arguments
Format
A dataframe with 5 columns and 30 rows.
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., https://www.jstatsoft.org/v59/i09/