goulden.latin {agridat} | R Documentation |
Latin square experiment for testing fungicide
data("goulden.latin")
A data frame with 25 observations on the following 4 variables.
trt
treatment factor, 5 levels
yield
yield
row
row
col
column
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. http://krishikosh.egranth.ac.in/handle/1/2034118
data(goulden.latin) dat <- goulden.latin if(require(desplot)){ desplot(yield ~ col*row, dat, text=trt, cex=1, # aspect unknown main="goulden.latin") } # Matches Goulden. m1 <- lm(yield~ trt + factor(row) + factor(col), data=dat) anova(m1)