copeland

copeland

Copeland's preferential voting method implementation. Outputs Copeland's score and ranking for each candidate.

Usage

Create ballot files

Just create plain text files with list of preferences for each voter. One candidate name per line.

Example:

a1.txt

Bob
Charlie
Alice
Donald

a2.txt

Donald
Alice
Charlie
Bob

a3.txt

Alice
Charlie
Bob
Donald

Run the program

copeland a1.txt a2.txt a3.txt

Example output:

Registered names:
	ALICE
	BOB
	CHARLIE
	DONALD

Scores:
	Rank 1:
		3	ALICE
	Rank 2:
		2	CHARLIE
	Rank 3:
		1	BOB
	Rank 4:
		0	DONALD

Note: candidate which scored against every other candidate (having score N-1 with default scoring settings, where N is number of candidates), also happens to be a Condorcet winner.

Synopsis

$ copeland -h
Usage:

copeland [OPTION]... [BALLOT FILE OR DIRECTORY]...

  Process files with preference lists and output Copeland's ranking.

Options:
  -names string
    	filename of list of names in the voting. If not specified names inferred from first ballot
  -normalize-case
    	normalize case (default true)
  -score-loss float
    	score for tie against opponent
  -score-tie float
    	score for tie against opponent (default 0.5)
  -score-win float
    	score for win against opponent (default 1)
  -skip-errors
    	skip ballot errors, but still report them
  -version
    	show program version and exit