ssp.plot {agricolae} | R Documentation

## Split-split-Plot analysis

### Description

The variance analysis of a split-split plot design is divided into three parts: the main-plot, subplot and sub-subplot analysis.

### Usage

    ssp.plot(block, pplot, splot, ssplot, Y)

### Arguments

`block` | replications
`pplot` | Factor main plot
`splot` | Factor subplot
`ssplot` | Factor sub-subplot
`Y` | Variable, response

### Details

The split-split-plot design is an extension of the split-plot design to accommodate a third factor: one factor in main-plot, other in subplot and the third factor in sub-subplot

### Value

ANOVA: Splip Split plot analysis

### Author(s)

Felipe de Mendiburu

### References

Statistical procedures for agricultural research. Kwanchai A. Gomez, Arturo A. Gomez. Second Edition. 1984.

### See Also

`sp.plot`, `strip.plot`, `design.split`, `design.strip`

### Examples

    # Statistical procedures for agricultural research, pag 143
    # Grain Yields of Three Rice Varieties Grown under
    #Three Management practices and Five Nitrogen levels; in a
    #split-split-plot design with nitrogen as main-plot,
    #management practice as subplot, and variety as sub-subplot
    #factores, with three replications.
    library(agricolae)
    f <- system.file("external/ssp.csv", package="agricolae")
    ssp<-read.csv(f)
    model<-with(ssp,ssp.plot(block,nitrogen,management,variety,yield))
    gla<-model$gl.a; glb<-model$gl.b; glc<-model$gl.c
    Ea<-model$Ea; Eb<-model$Eb; Ec<-model$Ec
    par(mfrow=c(1,3),cex=0.6)
    out1<-with(ssp,LSD.test(yield,nitrogen,gla,Ea,console=TRUE))
    out2<-with(ssp,LSD.test(yield,management,glb,Eb,console=TRUE))
    out3<-with(ssp,LSD.test(yield,variety,glc,Ec,console=TRUE))
    plot(out1,xlab="Nitrogen",las=1,variation="IQR")
    plot(out2,xlab="Management",variation="IQR")
    plot(out3,xlab="Variety",variation="IQR")
    # with aov
    AOV<-aov(yield ~  block + nitrogen*management*variety + Error(block/nitrogen/management),data=ssp)
    summary(AOV)

[Package agricolae version 1.2-9 Index]