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.

### Format

`yield`

  grain yield in kg/ha

`planting`

  planting factor, P1=broadcast, P2=transplanted

`rep`

  rep, 3 levels

`nitro`

  nitrogen fertilizer, kg/ha

`gen`

  genotype, G1 to G6

`col`

  column

`row`

  row

### Details

Note, this is a superset of the the 'gomez.stripplot' data.

### 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

    data(gomez.stripsplitplot)
    dat <- gomez.stripsplitplot

    # Layout
    if(require(desplot)){
      desplot(gen ~ col*row, dat,
              out1=rep, col=nitro, text=planting, cex=1,
              main="gomez.stripsplitplot")
    }

    # 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)

    ## Not run:
    # 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 + row, dat,
                     x.between=0, y.between=0,
                     x.relation="free")

    ## End(Not run)

[Package agridat version 1.16 Index]