onofri.winterwheat {agridat} | R Documentation |
Yield of 8 durum winter wheat varieties across 7 years with 3 reps.
data("onofri.winterwheat")
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
Yield of 8 durum winter wheat varieties across 7 years with 3 reps.
Andrea Onofri, Egidio Ciriciofolo (2007). Using R to Perform the AMMI Analysis on Agriculture Variety Trials. R News, Vol. 7, No. 1, pp. 14-19.
Downloaded electronic version from here Nov 2015: http://www.casaonofri.it/Biometry/index.html
Used with permission of Andrea Onofri.
F. Mendiburu. AMMI. http://tarwi.lamolina.edu.pe/~fmendiburu/AMMI.htm
A. Onofri. http://accounts.unipg.it/~onofri/RTutorial/CaseStudies/WinterWheat.htm
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") }