nlme (version 3.1-143)

Oats: 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.