tukey: Multiple comparison: Tukey's test In ExpDes: Experimental Designs

Description

Performs the test of Tukey, for multiple comparison of means.

Usage

 `1` ```tukey(y, trt, DFerror, SSerror, alpha = 0.05, group = TRUE, main = NULL) ```

Arguments

 `y` Numeric or complex vector containing the response variable. `trt` Numeric or complex vector containing the treatments. `DFerror` Error degrees of freedom. `SSerror` Error sum of squares. `alpha` Significance level. `group` TRUE or FALSE `main` Title

Details

It is necessary first makes a analysis of variance.

Value

y Numeric trt factor DFerror Numeric MSerror Numeric alpha Numeric group Logic main Text

Author(s)

Denismar Alves Nogueira

Eric Batista Ferreira

Portya Piscitelli Cavalcanti

(Adapted from Felipe de Mendiburu - GPL)

References

Principles and procedures of statistics a biometrical approach Steel and Torry and Dickey. Third Edition 1997

`snk`, `duncan`, `lsd`, `lsdb`, `ccboot`, `scottknott`, `ccf`

Examples

 ```1 2 3``` ```data(ex1) attach(ex1) crd(trat, ig, quali = TRUE, mcomp='tukey', sigT = 0.05) ```

Example output

```------------------------------------------------------------------------
Analysis of Variance Table
------------------------------------------------------------------------
DF     SS     MS     Fc     Pr>Fc
Treatament  3 214.88 71.626 6.5212 0.0029622
Residuals  20 219.67 10.984
Total      23 434.55
------------------------------------------------------------------------
CV = 3.41 %

------------------------------------------------------------------------
Shapiro-Wilk normality test
p-value:  0.91697
According to Shapiro-Wilk normality test at 5% of significance, residuals can be considered normal.
------------------------------------------------------------------------

Tukey's test
------------------------------------------------------------------------
Groups Treatments Means
a 	 0 	 102.1983
b 	 10 	 96.74333
b 	 5 	 95.05833
b 	 15 	 94.74333
------------------------------------------------------------------------
```

ExpDes documentation built on May 18, 2018, 1:03 a.m.