IAcontrasts {BSagri} | R Documentation |
Builds a family of intercation contrasts for complete two-factorial designs.
IAcontrasts(type, k)
type |
a vector of two character strings, specifying the contrast type , currently, "Tukey" , "Dunnett" , "Sequence" or "Identity" are accepted |
k |
a vector of two integers, specifying the number of groups in each factor of the two-factorial design |
Creates contrast matrices using contrMat
from package multcomp, creates the kronecker product of both and creates suitable columnnames.
A matrix with k[1]*k[2] columns and a number of rows depending on type.
for 2-way interaction contrasts directly based on 2 contrasts matrices, see IAcontrastsCMAT
;
two possibilities to specify appropriate rownames are implemented in function c2compnames
IAC<-IAcontrasts(type=c("Tukey", "Tukey"), k=c(3,4)) IAC IAC2<-c2compnames(IAC, ntype="sequ") IAC2