HSD.test {agricolae} | R Documentation |
It makes multiple comparisons of treatments by means of Tukey. The level by alpha default is 0.05.
HSD.test(y, trt, DFerror, MSerror, alpha = 0.05, group=TRUE, main = NULL)
y |
Variable response |
trt |
Treatments |
DFerror |
Degree free |
MSerror |
Mean Square Error |
alpha |
Significant level |
group |
TRUE or FALSE |
main |
Title |
It is necessary first makes a analysis of variance.
y |
Numeric |
trt |
factor |
DFerror |
Numeric |
MSerror |
Numeric |
alpha |
Numeric |
group |
Logic |
main |
Text |
Felipe de Mendiburu
Principles and procedures of statistics a biometrical approach Steel & Torry & Dickey. Third Edition 1997
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") detach(sweetpotato)