agricolae (version 1.0-4)

HSD.test: 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)

Arguments

y

Variable response

trt

Treatments

DFerror

Degree free

MSerror

Mean Square Error

alpha

Significant level

group

TRUE or FALSE

main

Title

Value

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

Details

It is necessary first makes a analysis of variance.

References

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

See Also

LSD.test, waller.test

Examples

library(agricolae)
data(sweetpotato)
attach(sweetpotato)
model<-aov(yield~virus)
df<-df.residual(model)
MSerror<-deviance(model)/df
comparison <- HSD.test(yield,virus,df,MSerror, group=TRUE,
main="Yield of sweetpotato. Dealt with different virus")