gomez.stripsplitplot {agridat}R Documentation

Rice strip-split-plot experiment

Description

A strip-split-plot experiment with three reps, genotype as the horizontal strip, nitrogen fertilizer as the vertical strip, and planting method as the subplot factor.

Usage

gomez.stripsplitplot

Format

yield

Grain yield in kg/ha

planting

Planting factor, P1=broadcast, P2=transplanted

rep

Rep factor, 3 levels

nitro

Nitrogen fertilizer in kg/ha

gen

Genotype factor, G1 to G6

x

Ordinate in the field

y

Ordinate in the field

Source

Gomez, K.A. and Gomez, A.A.. 1984, Statistical Procedures for Agricultural Research. Wiley-Interscience. Page 155.

Used with permission of Kwanchai Gomez.

Examples

## Not run: 
dat <- gomez.stripsplitplot

# Layout
desplot(gen~x+y, dat, out1=rep, out2=gen, col=nitro, text=planting,
cex=1)

# Gomez table 4.19, ANOVA of strip-split-plot design
dat <- transform(dat, nf=factor(nitro))
m1 <- aov(yield ~ nf * gen * planting +
          Error(rep + rep:nf + rep:gen + rep:nf:gen), data=dat)
summary(m1)

# There is a noticeable linear trend along the y coordinate which may be
# an artifact that blocking will remove, or may need to be modeled.
# Note the outside values in the high-nitro boxplot.
require("HH")
interaction2wt(yield ~ nitro + gen + planting + y, dat, x.relation="free")

## End(Not run)

[Package agridat version 1.4 Index]