Yield and sugar percentage in sugar beets from a split plot experiment.

Description

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

data(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
            +-----------|-----------|-----------+  

Examples

data(beets)
## maybe str(beets) ; plot(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))