Oats {nlme} | R Documentation

## Split-plot Experiment on Varieties of Oats

### Description

The `Oats` data frame has 72 rows and 4 columns.

### Format

This data frame contains the following columns:

Block
  an ordered factor with levels `VI` < `V` < `III` < `IV` < `II` < `I`
Variety
  a factor with levels `Golden Rain` `Marvellous` `Victory`
nitro
  a numeric vector
yield
  a numeric vector

### Details

These data have been introduced by Yates (1935) as an example of a split-plot design. The treatment structure used in the experiment was a 3$times$4 full factorial, with three varieties of oats and four concentrations of nitrogen. The experimental units were arranged into six blocks, each with three whole-plots subdivided into four subplots. The varieties of oats were assigned randomly to the whole-plots and the concentrations of nitrogen to the subplots. All four concentrations of nitrogen were used on each whole-plot.

### Source

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York. (Appendix A.15)

Venables, W. N. and Ripley, B. D. (1999) Modern Applied Statistics with S-PLUS (3rd ed), Springer, New York.

[Package nlme version 3.1-68.1 Index]