doBy (version 4.5-10)

beets: 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))