Incomplete-block experiment of maize in Ethiopia.
Incomplete-block experiment of maize in Ethiopia.
data("damesa.maize")A data frame with 264 observations on the following 8 variables.
sitesite, 4 levels
repreplicate, 3 levels
blockincomplete block
plotplot number
gengenotype, 22 levels
rowrow ordinate
colcolumn ordinate
yieldyield, t/ha
An experiment harvested in 2012, evaluating drought-tolerant maize hybrids at 4 sites in Ethiopia. At each, an incomplete-block design was used.
Damesa et al use this data to compare single-stage and two-stage analyses.
Tigist Mideksa Damesa, Jens Möhring, Mosisa Worku, Hans-Peter Piepho (2017). One Step at a Time: Stage-Wise Analysis of a Series of Experiments. Agronomy J, 109, 845-857. https://doi.org/10.2134/agronj2016.07.0395
https://schmidtpaul.github.io/MMFAIR/weighted_two_stage.html
## Not run:
library(agridat)
libs(desplot)
desplot(damesa.maize,
yield ~ col*row|site,
main="damesa.maize",
out1=rep, out2=block, num=gen, cex=1)
if(0){
# Fit the single-stage model in Damesa
lib(asreml)
m0 <- asreml(data=damesa.maize,
fixed = yield ~ gen,
random = ~ site + gen:site + at(site):rep/block,
residual = ~ dsum( ~ units|site) )
lucid::vc(m0) # match Damesa table 1 column 3
## effect component std.error z.ratio bound
## at(site, S1):rep 0.08819 0.1814 0.49 P 0
## at(site, S2):rep 1.383 1.426 0.97 P 0
## at(site, S3):rep 0 NA NA B 0
## at(site, S4):rep 0.01442 0.02602 0.55 P 0
## site 10.45 8.604 1.2 P 0.1
## gen:site 0.1054 0.05905 1.8 P 0.1
## at(site, S1):rep:block 0.3312 0.3341 0.99 P 0
## at(site, S2):rep:block 0.4747 0.1633 2.9 P 0
## at(site, S3):rep:block 0 NA NA B 0
## at(site, S4):rep:block 0.06954 0.04264 1.6 P 0
## site_S1!R 1.346 0.3768 3.6 P 0
## site_S2!R 0.1936 0.06628 2.9 P 0
## site_S3!R 1.153 0.2349 4.9 P 0
## site_S4!R 0.1112 0.03665 3 P 0
}
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