agridat (version 1.23)

kang.peanut: Multi-environment trial of peanuts for 10 genotypes in 15 environments

Description

Peanut yields for 10 genotypes in 15 environments

Usage

data("kang.peanut")

Format

A data frame with 590 observations on the following 4 variables.

gen

genotype factor, 10 levels

rep

replicate factor, 4 levels

yield

yield

env

environment factor, 15 levels

Details

Florman, Tegua, mf484, mf485, mf487, mf489 have a long crop cycle. The others have a short crop cycle.

This data is also likely used in Casanoves et al 2005, "Evaluation of Multienvironment Trials of Peanut Cultivars", but this appears to be a slightly smaller subset (only 10 genotypes, and perhaps only the years 96,97,98,99). Based on the d.f. in their table 5, it appears that environment E13 was grown in 1998. (5 loc * (4-1) = 15, but the table has 14, and 98-99 had only 3 reps instead of 4 reps.)

Data from National Institute of Agricultural Technology, Argentina.

References

Johannes Forkman, Julie Josse, Hans-Peter Piepho (2019). Hypothesis Tests for Principal Component Analysis When Variables are Standardized. JABES https://doi.org/10.1007/s13253-019-00355-5

Examples

if (FALSE) {

library(agridat)
data(kang.peanut)
dat <- kang.peanut

# Table 5.1 of Kang et al. (Chapter 5 of Saxton)
libs(reshape2)
Y0 <- acast(dat, env~gen, value.var='yield', fun=mean)
round(Y0,2)

# GGE biplot of Kang, p. 82.
libs(gge)
m1 <- gge(dat, yield~gen*env, scale=FALSE)
biplot(m1, flip=c(1,1), main="kang.peanut - GGE biplot")

# Forkman 2019, fig 2
# m2 <- gge(dat, yield~gen*env, scale=TRUE)
# biplot(m2, main="kang.peanut - GGE biplot")
# biplot(m2, comps=3:4, main="kang.peanut - GGE biplot")

}