Latin square experiment for testing fungicide
Latin square experiment for testing fungicide
data("goulden.latin")A data frame with 25 observations on the following 4 variables.
trttreatment factor, 5 levels
yieldyield
rowrow
colcolumn
Five treatments were tested to control stem rust in wheat. Treatment codes and descriptions: A = Dusted before rains. B = Dusted after rains. C = Dusted once each week. D = Drifting, once each week. E = Not dusted.
Cyrus H. Goulden (1952). Methods of Statistical Analysis, 2nd ed. Page 216.
## Not run:
library(agridat)
library(agridat)
data(goulden.latin)
dat <- goulden.latin
libs(desplot)
desplot(dat, yield ~ col*row,
text=trt, cex=1, # aspect unknown
main="goulden.latin")
# Matches Goulden.
m1 <- lm(yield~ trt + factor(row) + factor(col), data=dat)
anova(m1)
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