npk:
Classical N, P, K Factorial Experiment
Description
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.
Format
The npk
data frame has 24 rows and 5 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.