visualize associations between two groups of data

Question

Where each datapoint has a pairing of A and B and there multiple entries in A and multiple entires in B. IE multiple syndromes and multiple diagnoses, although for each data

Answer 1

Maybe mosaicplot:

X <- structure(list(
  ID = 1:50,
  A = structure(c(6L, 1L, 2L, 4L, 4L, 3L, 7L, 1L, 3L, 4L, 1L, 1L, 4L, 4L, 1L, 3L, 5L, 5L, 2L, 6L, 6L, 1L, 1L, 1L, 3L, 3L, 5L, 6L, 3L, 2L, 8L, 5L, 2L, 6L, 5L, 2L, 8L, 3L, 5L, 1L, 1L, 6L, 2L, 8L, 8L, 4L, 1L, 2L, 6L, 2L), .Label = c("AA","BB", "CC", "DD", "FF", "GG", "HH", "II"), class = "factor"),
  B = structure(c(3L, 2L, 6L, 2L, 3L, 6L, 8L, 3L, 1L, 8L, 6L, 3L, 2L, 6L, 7L, 8L, 2L, 6L, 5L, 5L, 2L, 1L, 3L, 2L, 5L, 3L, 1L, 4L, 3L, 8L, 3L, 1L, 2L, 7L, 1L, 5L, 1L, 7L, 5L, 6L, 8L, 5L, 4L, 4L, 2L, 2L, 4L, 5L, 3L, 3L), .Label = c("RR", "SS", "TT", "UU", "VV", "XX", "YY", "ZZ"), class = "factor")
  ), .Names = c("ID", "A", "B"), class = "data.frame", row.names = c(NA, -50L)
)

mosaicplot(with(X,table(A,B)))

For you example dataset: