MCDA (version 0.1.0)

MRSortIdentifyIncompatibleAssignments: Identifies all sets of assignment examples which are incompatible with the MRSort method.

Description

This MRSort method, which is a simplification of the Electre TRI method, uses the pessimistic assignment rule, without indifference or preference thresholds attached to criteria. Only a binary discordance condition is considered, i.e. a veto forbids an outranking in any possible concordance situation, or not. This function outputs for all (or a fixed number of) sets of incompatible assignment examples ranging in size from the minimal size and up to a given threshold. The retrieved sets are also not contained in each other.

Usage

MRSortIdentifyIncompatibleAssignments(
  performanceTable,
  assignments,
  categoriesRanks,
  criteriaMinMax,
  veto = FALSE,
  incompatibleSetsLimit = 100,
  largerIncompatibleSetsMargin = 0,
  alternativesIDs = NULL,
  criteriaIDs = NULL
)

Value

The function returns NULL if there is a problem, or a list containing a list of incompatible sets of alternatives as vectors and the status of the execution.

Arguments

performanceTable

Matrix or data frame containing the performance table. Each row corresponds to an alternative, and each column to a criterion. Rows (resp. columns) must be named according to the IDs of the alternatives (resp. criteria).

assignments

Vector containing the assignments (IDs of the categories) of the alternatives to the categories. The elements are named according to the alternatives.

categoriesRanks

Vector containing the ranks of the categories. The elements are named according to the IDs of the categories.

criteriaMinMax

Vector containing the preference direction on each of the criteria. "min" (resp. "max") indicates that the criterion has to be minimized (maximized). The elements are named according to the IDs of the criteria.

veto

Boolean parameter indicating whether veto profiles are being used by the model or not.

incompatibleSetsLimit

Pozitive integer denoting the upper limit of the number of sets to be retrieved.

largerIncompatibleSetsMargin

Pozitive integer denoting whether sets larger than the minimal size should be retrieved, and by what margin. For example, if this is 0 then only sets of the minimal size will be retrieved, if this is 1 then sets also larger by 1 element will be retrieved.

alternativesIDs

Vector containing IDs of alternatives, according to which the datashould be filtered.

criteriaIDs

Vector containing IDs of criteria, according to which the data should be filtered.

References

Bouyssou, D. and Marchant, T. An axiomatic approach to noncompen- satory sorting methods in MCDM, II: more than two categories. European Journal of Operational Research, 178(1): 246--276, 2007.

Examples

performanceTable <- rbind(c(10,10,9), c(10,9,10), c(9,10,10), c(9,9,10), 
                          c(9,10,9), c(10,9,9), c(10,10,7), c(10,7,10), 
                          c(7,10,10), c(9,9,17), c(9,17,9), c(17,9,9), 
                          c(7,10,17), c(10,17,7), c(17,7,10), c(7,17,10), 
                          c(17,10,7), c(10,7,17), c(7,9,17), c(9,17,7), 
                          c(17,7,9), c(7,17,9), c(17,9,7), c(9,7,17))

rownames(performanceTable) <- c("a1", "a2", "a3", "a4", "a5", "a6", "a7", 
                                "a8", "a9", "a10", "a11", "a12", "a13", 
                                "a14", "a15", "a16", "a17", "a18", "a19", 
                                "a20", "a21", "a22", "a23", "a24")

colnames(performanceTable) <- c("c1","c2","c3")

assignments <-c("P", "P", "P", "F", "F", "F", "F", "F", "F", "P", "F", 
                "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", "F", 
                "F", "F")

names(assignments) <- rownames(performanceTable)

categoriesRanks <-c(1,2)

names(categoriesRanks) <- c("P","F")

criteriaMinMax <- c("max","max","max")

names(criteriaMinMax) <- colnames(performanceTable)

incompatibleAssignmentsSets<-MRSortIdentifyIncompatibleAssignments(
                               performanceTable, assignments, 
                               categoriesRanks, criteriaMinMax, 
                               veto = TRUE, 
                               alternativesIDs = c("a1","a2","a3","a4",
                               "a5","a6","a7","a8","a9","a10"))

print(incompatibleAssignmentsSets)

filteredAlternativesIDs <- setdiff(c("a1","a2","a3","a4","a5","a6","a7","a8","a9"),
                                   incompatibleAssignmentsSets[[1]][1])

print(filteredAlternativesIDs)

x<-MRSortInferenceExact(performanceTable, assignments, categoriesRanks, 
                        criteriaMinMax, veto = TRUE, 
                        readableWeights = TRUE, readableProfiles = TRUE,
                        alternativesIDs = filteredAlternativesIDs)

ElectreAssignments<-MRSort(performanceTable, x$profilesPerformances,
                           categoriesRanks, x$weights,
                           criteriaMinMax, x$lambda, 
                           criteriaVetos=x$vetoPerformances,
                           alternativesIDs = filteredAlternativesIDs)