HSD.test {agricolae} R Documentation

## Multiple comparisons: Tukey

### Description

It makes multiple comparisons of treatments by means of Tukey. The level by alpha default is 0.05.

### Usage

```HSD.test(y, trt, DFerror, MSerror, alpha = 0.05, group=TRUE, main = NULL,
unbalanced=FALSE,console=FALSE)
```

### Arguments

 `y` model(aov or lm) or answer of the experimental unit `trt` Constant( only y=model) or vector treatment applied to each experimental unit `DFerror` Degree free `MSerror` Mean Square Error `alpha` Significant level `group` TRUE or FALSE `main` Title `unbalanced` TRUE or FALSE. not equal replication `console` logical, print output

### Details

It is necessary first makes a analysis of variance.

if y = model, then to apply the instruction:
HSD.test (model, "trt", alpha = 0.05, group = TRUE, main = NULL, unbalanced=FALSE, console=FALSE)
where the model class is aov or lm.

### Value

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

### Author(s)

Felipe de Mendiburu

### References

1. Principles and procedures of statistics a biometrical approach Steel & Torry & Dickey. Third Edition 1997
2. Multiple comparisons theory and methods. Departament of statistics the Ohio State University. USA, 1996. Jason C. Hsu. Chapman Hall/CRC.

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

### Examples

```library(agricolae)
data(sweetpotato)
model<-aov(yield~virus, data=sweetpotato)
out <- HSD.test(model,"virus", group=TRUE,console=TRUE,
main="Yield of sweetpotato\nDealt with different virus")
#stargraph
# Variation range: max and min
plot(out)
#endgraph
out<-HSD.test(model,"virus", group=FALSE)
print(out\$comparison)
# Old version HSD.test()
df<-df.residual(model)
MSerror<-deviance(model)/df
with(sweetpotato,HSD.test(yield,virus,df,MSerror, group=TRUE,console=TRUE,
main="Yield of sweetpotato. Dealt with different virus"))
```

[Package agricolae version 1.3-5 Index]