diffograph {agricolae} | R Documentation

## Plotting the multiple comparison of means

### Description

It plots bars of the averages of treatments to compare. It uses the objects generated by a procedure of comparison like LSD (Fisher), duncan, Tukey (HSD), Student Newman Keul (SNK), Scheffe, Ryan, Einot and Gabriel and Welsch (REGW), Kruskal Wallis, Friedman and Waerden.

### Usage

    diffograph(x, main=NULL,color1="red",color2="blue",color3="black",
    cex.axis=0.8,las=1,pch=20,bty="l",cex=0.8,lwd=1,xlab="",ylab="",...)

### Arguments

`x` | Object created by a test of comparison, group=FALSE
`main` | The main title (on top)
`color1` | non significant color
`color2` | significant color
`color3` | center line color
`cex.axis` | parameters of the plot()
`las` | parameters of the plot()
`pch` | parameters of the plot()
`bty` | parameters of the plot()
`cex` | parameters of the plot()
`lwd` | parameters of the plot()
`xlab` | parameters of the plot()
`ylab` | parameters of the plot()
`...` | Other parameters of the function plot()

### Details

The graph.diff function should be used for functions: LSD, duncan, SNK, scheffe, REGW, HSD, kruskal, friedman and waerden test.

### Value

`x` | list, object comparison test

### Author(s)

Felipe de Mendiburu

### References

Multiple comparisons theory and methods. Departament of statistics the Ohio State University. USA, 1996. Jason C. Hsu. Chapman Hall/CRC

### See Also

`LSD.test`, `HSD.test`, `duncan.test`, `SNK.test`, `scheffe.test`, `REGW.test`, `kruskal`,`friedman`, `waerden.test`

### Examples

    # Example 1
    library(agricolae)
    data(sweetpotato)
    model<-aov(yield~virus,data=sweetpotato)
    x<- LSD.test(model,"virus",alpha=0.01,group=FALSE)
    diffograph(x,cex.axis=0.8,xlab="Yield",ylab="")
    # Example 2
    x<- REGW.test(model,"virus",alpha=0.01,group=FALSE)
    diffograph(x,cex.axis=0.6,xlab="Yield",ylab="",color1="brown",color2="green")

[Package agricolae version 1.2-9 Index]