Convert between ranking and ordering.
create_ranking takes a vector or matrix of ordered items orderings and returns a corresponding vector or matrix of ranked items. create_ordering takes a vector or matrix of rankings rankings and returns a corresponding vector or matrix of ordered items.
create_ranking(orderings) create_ordering(rankings)
orderings: A vector or matrix of ordered items. If a matrix, it should be of size N times n, where N is the number of samples and n is the number of items.rankings: A vector or matrix of ranked items. If a matrix, it should be N times n, where N is the number of samples and n is the number of items.A vector or matrix of rankings. Missing orderings coded as NA are propagated into corresponding missing ranks and vice versa.
# A vector of ordered items. orderings <- c(5, 1, 2, 4, 3) # Get ranks rankings <- create_ranking(orderings) # rankings is c(2, 3, 5, 4, 1) # Finally we convert it backed to an ordering. orderings_2 <- create_ordering(rankings) # Confirm that we get back what we had all.equal(orderings, orderings_2) # Next, we have a matrix with N = 19 samples # and n = 4 items set.seed(21) N <- 10 n <- 4 orderings <- t(replicate(N, sample.int(n))) # Convert the ordering to ranking rankings <- create_ranking(orderings) # Now we try to convert it back to an ordering. orderings_2 <- create_ordering(rankings) # Confirm that we get back what we had all.equal(orderings, orderings_2)
Other rank functions: compute_expected_distance(), compute_observation_frequency(), compute_rank_distance(), get_mallows_loglik(), sample_mallows()
Useful links