d011 <- read.table(here::here("data", "OATS.txt"), header = TRUE)D011. Split-plot design of oats varieties
The data file can be downloaded here:
Yield of oats (yield) from a field experiment with 3 varieties (variety) and 4 levels of nitrogen fertilizer (factor: nitrogen; numeric: nrate) (Yates 1935). The experiment followed a split-plot design with 6 blocks (block) of 3 main plots (varieties; wplot), each split into 4 sub-plots (nitrogen; subplot). In other words, this means that each block is separated in 3 plots and in each of these plot there is only one variety. A plot corresponds to 4 individuals which are all assigned a different level of nitrogen. The dataset is available from the asreml package (Gilmour et al. 1995).
| block | nitrogen | subplot | variety | wplot | yield | column | row | nrate |
|---|---|---|---|---|---|---|---|---|
| 1 | 0.6_cwt | 1 | Marvellous | 1 | 156 | 1 | 1 | 0.6 |
| 1 | 0.4_cwt | 2 | Marvellous | 1 | 118 | 2 | 1 | 0.4 |
| 1 | 0.2_cwt | 3 | Marvellous | 1 | 140 | 1 | 2 | 0.2 |
| 1 | 0_cwt | 4 | Marvellous | 1 | 105 | 2 | 2 | 0.0 |
| 1 | 0_cwt | 1 | Victory | 2 | 111 | 1 | 3 | 0.0 |
| 1 | 0.2_cwt | 2 | Victory | 2 | 130 | 2 | 3 | 0.2 |
| 1 | 0.6_cwt | 3 | Victory | 2 | 174 | 1 | 4 | 0.6 |
| 1 | 0.4_cwt | 4 | Victory | 2 | 157 | 2 | 4 | 0.4 |