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. (2002) Modern Applied Statistics with S. (4th ed), Springer, New York.