goulden.latin.Rd
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.
# \dontrun{ 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")#> Analysis of Variance Table #> #> Response: yield #> Df Sum Sq Mean Sq F value Pr(>F) #> trt 4 196.608 49.152 21.0321 2.366e-05 *** #> factor(row) 4 46.668 11.667 4.9923 0.01328 * #> factor(col) 4 14.020 3.505 1.4998 0.26343 #> Residuals 12 28.044 2.337 #> --- #> Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1# }