Plotting the multiple comparison of means

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.

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()

Value

x

list, object comparison test

Details

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

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")