agricolae (version 1.0-1)

LSD.test: Multiple comparisons, "Least significant difference"

Description

Multiple comparisons of treatments by means of LSD and a grouping of treatments. The level by alpha default is 0.05.

Usage

LSD.test(y, trt, DFerror, MSerror, alpha = 0.05, group=TRUE, main = NULL)

Arguments

y

Answer of the experimental unit

trt

Treatment applied to each experimental unit

DFerror

Degrees of freedom of the experimental error

MSerror

Means square error of the experimental

alpha

Level of risk for the test

group

TRUE or FALSE

main

title of the study

Value

• The meaning is given by * for the level alpha.
• y
  Numeric
• trt
  alfanumeric
• DFerror
  Numeric
• MSerror
  Numeric
• alpha
  Numeric
• group
  Logic
• main
  Numeric

Details

For equal or different repetition.

References

Steel, R.; Torri,J; Dickey, D.(1997) Principles and Procedures of Statistics A Biometrical Approach. pp178.

See Also

HSD.test, waller.test, bar.err, bar.group

Examples

library(agricolae)
data(sweetpotato)
attach(sweetpotato)
model<-aov(yield~virus)
df<-df.residual(model)
MSerror<-deviance(model)/df
comparison <- LSD.test(yield,virus,df,MSerror, group=FALSE,
main="Yield of sweetpotato
dealt with different virus")
#stargraph
bar.err(comparison,std=TRUE,ylim=c(0,45),density=4,border="blue")
#endgraph