Oats                  package: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.

Examples:

     data(Oats)

