bar.err {agricolae} | R Documentation

## Plotting the standard error or standard deviance of a multiple comparison of means

### Description

It plots bars of the averages of treatments and standard error or standard deviance. It uses the objects generated by a procedure of comparison like LSD, HSD, Kruskal and Waller-Duncan.

### Usage

    bar.err(x,variation=c("SE","SD","range","IQR"),horiz=FALSE, bar=TRUE,...)

### Arguments

`x` | object means of the comparisons the LSD.test, HSD.test,...,etc
`variation` | SE=standard error, range=Max-Min or IQR=interquartil range
`horiz` | Horizontal or vertical bars
`bar` | paint bar
`...` | Parameters of the function barplot()

### Details

x: data frame formed by 5 columns: name of the bars, height, level out: LSD.test, HSD, waller.test, scheffe.test, duncan.test, SNK.test, friedman, kruskal, waerden.test and Median.test.

### Value

A list with numeric vectors giving the coordinates of all the bar midpoints drawn.

`x` | eje-1 coordinate
`height` | eje-2 coordinate by group

### Author(s)

Felipe de Mendiburu

### See Also

`LSD.test`, `HSD.test`, `waller.test`, `kruskal`, `bar.group`

### Examples

    library(agricolae)
    data(sweetpotato)
    model<-aov(yield~virus,data=sweetpotato)
    out <- waller.test(model,"virus", console=TRUE,
    main="Yield of sweetpotato\ndealt with different virus")
    par(mfrow=c(2,2),cex=1)
    bar.err(out$means,variation="range",horiz=TRUE,xlim=c(0,45),angle=125,density=6,
     main="range")
    bar.err(out$means,variation="SD",ylim=c(0,45),col=colors()[30],
     main="Standard deviation",density=8)
    bar.err(out$means,variation="SE",horiz=TRUE,xlim=c(0,45),density=8,
     col="brown",main="Standard error")
    bar.err(out$means,variation="range",ylim=c(0,45),bar=FALSE,col="green",
     main="range")
    par(mfrow=c(1,2),cex=1)
    bar.err(out$means,variation="range",ylim=c(0,45),bar=FALSE,col=0)
    abline(h=0)
    # horiz = TRUE
    bar.err(out$means,variation="SE",horiz=TRUE,xlim=c(0,45),bar=FALSE,col=0)
    #startgraph
    par(mfrow=c(1,1))
    #endgraph

[Package agricolae version 1.2-9 Index]