IAcontrastsCMAT: Interaction contrasts for a two-factorial design
In BSagri: Safety Assessment in Agricultural Field Trials

Description Usage Arguments Details Value See Also Examples

Builds a family of intercation contrasts for complete two-factorial designs.

1	IAcontrastsCMAT(CMAT1, CMAT2)

`CMAT1`	a (named) contrast matrix
`CMAT2`	a (named) contrast matrix

Builds the kronecker product of CMAT1 and CMAT2 and creates suitable columnnames. Note that CMAt1 and CMAT2 are not checked, and hence its up to the user to define them suitably.

A matrix with k[1]*k[2] columns.

for interaction contrasts based on contrast definition and the number of levels of the factors in atwo-way layout, see IAcontrasts; two possibilities to specify appropriate rownames are implemented in function c2compnames

library(multcomp)


n1<-c(10,10,10,10)
names(n1)<-c("A","B","C","D")

n2<-c(3,3,3)
names(n2)<-c(1,2,3)

CMT1<-contrMat(n1, type="Tukey")

CMT2<-contrMat(n2, type="Tukey")

IAC<-IAcontrastsCMAT(CMAT1=CMT1, CMAT2=CMT2)

c2compnames(IAC, ntype="sequ")

###


n1<-c(10,10,10,10)
names(n1)<-c("A","B","C","D")

n2<-c(3,3,3)
names(n2)<-c(1,2,3)

CMD1<-contrMat(n1, type="Dunnett")

CMD2<-contrMat(n2, type="Dunnett")

IAC<-IAcontrastsCMAT(CMAT1=CMD1, CMAT2=CMD2)

c2compnames(IAC, ntype="sequ")