A classical N, P, K (nitrogen, phosphate, potassium) factorial experiment on the growth of peas conducted on 6 blocks. Each half of a fractional factorial design confounding the NPK interaction was used on 3 of the plots.
The npk data frame has 24 rows and 6 columns:
block
which block (label 1 to 6).
N
indicator (0/1) for the application of nitrogen.
P
indicator (0/1) for the application of phosphate.
K
indicator (0/1) for the application of potassium.
yield
Yield of peas, in pounds/plot (the plots were (1/70) acre).
Source
Imperial College, London, M.Sc. exercise sheet.
References
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.
Use the following R code to directly access this dataset in R.
