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

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 1.3-7 Index]