# bar.err: Plotting the standard error or standard deviance of a... In agricolae: Statistical Procedures for Agricultural Research

 bar.err 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

`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")
oldpar<-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(oldpar)
oldpar<-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(oldpar)
#endgraph
``````

agricolae documentation built on Oct. 23, 2023, 1:06 a.m.