potash {asbio} | R Documentation |
Potash/cotton strength data
Description
An oft-cited RCBD example is an agricultural experiment which evaluates the effect of levels of of soil KO (potash) on
the breaking strength of cotton fibers (Cochran and Cox 1957). Five levels of K
O were used in the soil subplots (
36, 54, 72, 108, and 144 lbs per acre) and a single sample of cotton was taken from each of five subplot.
The experiment had three blocks, and each of the K
O treatments was randomly assigned to the five subplots within each block.
Usage
data(potash)
Format
A data frame with 15 observations on the following 3 variables.
treatment
a factor with levels
36
54
72
108
144
block
a factor with levels
1
2
3
strength
a numeric vector
Source
Cochran, W. G. and G. M. Cox (1957) Experimental Designs (Second Edition). New York: John Wiley & Sons.
[Package asbio version 1.9-7 Index]