agridat (version 1.8.1)

cochran.latin: Latin square design

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.

source

Cochran, W.G. and Cox, G.M. (1957), Experimental Designs, 2nd ed., Wiley and Sons, New York.

Examples

dat <- cochran.latin

desplot(diff~col*row, dat, text=operator, cex=1, 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")