plurality_method: Plurality Method to Find Absolute or Relative Majority

In votesys: Voting Systems, Instant-Runoff Voting, Borda Method, Various Condorcet Methods

Description

Although with plurality method each voter is required to mention only one candidate, a ballot with more than one candidate and different scores is also valid. For a score matrix, the function will check the position j which has the lowest score (in a vote object, the lower, the better) in the ith row. Duplicated values may or may not be a problem. For instance, c(2, 3, 3) is valid, for the lowest value is 2 and it is in the 1st position. However, c(2, 2, 3) is a problem, for the 1st and 2nd positions all have the lowest value 2. If this problem exists, the winner returned by this function will be NULL.

Usage

plurality_method(x, allow_dup = TRUE, min_valid = 1)

Arguments

x	an object of class vote.
allow_dup	whether ballots with duplicated score values are taken into account. Default is TRUE.
min_valid	default is 1. If the number of valid entries of a ballot is less than this value, the ballot will not be used.

Value

a list object.

• (1) call the function call.

• (2) method the counting method.

• (3) candidate candidate names.

• (4) candidate_num number of candidate.

• (5) ballot_num number of ballots in x.

• (6) valid_ballot_num number of ballots that are used to compute the result.

• (7) winner the winners, may be one, more than one or NULL.

• (8) absolute whether the winner is of absolute majority.

• (9) other_info a list with 2 elements, the 1st is the frequencies of candidates mentioned as 1st choice; the second element is the percentage. If winner is NULL, these two are NULL.

Examples

raw <- rbind(
    c(1, 2, 5, 3, 3), c(1, 2, 5, 3, 4), c(1, 2, 5, 3, 4), 
    c(NA, NA, NA, NA, NA), c(NA, 3, 5, 1, 2), 
    c(NA, NA, NA, 2, 3), c(NA, NA, 1, 2, 3), 
    c(NA, NA, NA, NA, 2), c(NA, NA, NA, 2, 2), 
    c(NA, NA, 1, 1, 2), c(1, 1, 5, 5, NA)
)
vote <- create_vote(raw, xtype = 1)
y <- plurality_method(vote, allow_dup = FALSE)
y <- plurality_method(vote, allow_dup=FALSE, min_valid = 3)

Example output

MATCHING NAMES AND SCORES
COUNTING NA AND DUP VALUES
MAKING CONDORCET TABLE
COLLECTING RESULT
DONE
SELECTING
COLLECTING RESULT
DONE
SELECTING
COLLECTING RESULT
DONE

votesys documentation built on May 2, 2019, 1:32 p.m.