cochran.latin {agridat} | R Documentation |
Latin square design in wheat
Description
Six wheat plots were sampled by six operators and shoot heights measured. The operators sampled plots in six ordered sequences. The dependent variate was the difference between measured height and true height of the plot.
Format
A data frame with 36 observations on the following 4 variables.
row
row
col
column
operator
operator factor
diff
difference between measured height and true height
Source
Cochran, W.G. and Cox, G.M. (1957), Experimental Designs, 2nd ed., Wiley and Sons, New York.
Examples
## Not run:
library(agridat)
data(cochran.latin)
dat <- cochran.latin
libs(desplot)
desplot(dat, diff~col*row,
text=operator, cex=1, # aspect unknown
main="cochran.latin")
dat <- transform(dat, rf=factor(row), cf=factor(col))
aov.dat <- aov(diff ~ operator + Error(rf*cf), dat)
summary(aov.dat)
model.tables(aov.dat, type="means")
## End(Not run)
[Package agridat version 1.23 Index]