diss {amap} | R Documentation |
Compute a dissimilarity matrix from a data set (containing only factors).
diss(x, w=rep(1,ncol(x)) )
x |
A matrix or data frame containing only factors. |
w |
A vector of weight, by default each variable has got same weight |
Case of N individuals described by P categorical variables: each element (i,j) of the signed similarities array is computed by sommation over the P variables of the contributions of each variable, multiplied by the weight of the variable. The contribution of a given categorical variable is +1 if the individual i and j are in the same class, and is -1 if they are not.
A dissimilarity matrix.
Antoine Lucas
data <- matrix(c(1,1,1,1,1 ,1,2,1,2,1 ,2,3,2,3,2 ,2,4,3,3,2 ,1,2,4,2,1 ,2,3,2,3,1),ncol=5,byrow=TRUE) diss(data) ## With weights diss(data,w=c(1,1,2,2,3))