R: Median test. Multiple comparisons

Median.test {agricolae} | R Documentation

## Median test. Multiple comparisons

### Description

A nonparametric test for several independent samples. The median test is designed to examine whether several samples came from populations having the same median.

### Usage

    Median.test(y,trt,alpha=0.05,correct=TRUE,simulate.p.value = FALSE, group = TRUE,
    main = NULL,console=TRUE)

### Arguments

`y` | Variable response
`trt` | Treatments
`alpha` | error type I
`correct` | a logical indicating whether to apply continuity correction when computing the test statistic for 2 groups. The correction will not be bigger than the differences themselves. No correction is done if simulate.p.value = TRUE.
`simulate.p.value` | a logical indicating whether to compute p-values by Monte Carlo simulation
`group` | TRUE or FALSE
`main` | Title
`console` | logical, print output

### Details

The data consist of k samples of possibly unequal sample size.
Greater: is the number of values that exceed the median of all data and
LessEqual: is the number less than or equal to the median of all data.

### Value

`statistics` | Statistics of the model
`parameters` | Design parameters
`medians` | Statistical summary of the study variable
`comparison` | Comparison between treatments
`groups` | Formation of treatment groups

### Author(s)

Felipe de Mendiburu

### References

Practical Nonparametrics Statistics. W.J. Conover, 1999

### See Also

`BIB.test`, `DAU.test`, `duncan.test`, `durbin.test`, `friedman`, `HSD.test`, `kruskal`, `LSD.test`, `PBIB.test`, `REGW.test`, `scheffe.test`, `SNK.test`, `waerden.test`, `waller.test`, `plot.group`

### Examples

    library(agricolae)
    # example 1
    data(corn)
    out<-with(corn,Median.test(observation,method,console=FALSE))
    z<-bar.err(out$medians,variation = "range",ylim=c(0,120),
               space=2,border=4,col=3,density=10,angle=45)
    # example 2
    out<-with(corn,Median.test(observation,method,console=FALSE,group=FALSE))
    print(out$comparison)

[Package agricolae version 1.2-8 Index]