agridat (version 1.16)

onofri.winterwheat: Yield of winter wheat varieties across 7 years.

Description

Yield of 8 durum winter wheat varieties across 7 years with 3 reps.

Usage

data("onofri.winterwheat")

Format

A data frame with 168 observations on the following 5 variables.

year

year, numeric

block

block, 3 levels

plot

plot, numeric

gen

genotype, 7 levels

yield

yield for each plot

Details

Yield of 8 durum winter wheat varieties across 7 years with 3 reps.

References

F. Mendiburu. AMMI. http://tarwi.lamolina.edu.pe/~fmendiburu/AMMI.htm

A. Onofri. http://accounts.unipg.it/~onofri/RTutorial/CaseStudies/WinterWheat.htm

Examples

# NOT RUN {
data(onofri.winterwheat)
dat <- onofri.winterwheat
dat <- transform(dat, year=factor(dat$year))

m1 <- aov(yield ~ year + block:year + gen + gen:year, dat)
anova(m1) # Matches Onofri figure 1

if(require(agricolae)){
  m2 <- AMMI(dat$year, dat$gen, dat$block, dat$yield)
  plot(m2)
  title("onofri.winterwheat - AMMI biplot")
}

# }