Respondent ID (1)	Respondent choice (2)	Added column for candidate 1 (3)	Added column for candidate 2 (4)	Difference between candidates 1 and 2 (5)=(3)–(4)
1	Candidate 1	1	0	1
2	Candidate 3	0	0	0
3	Candidate 2	0	1	–1
..	……	…	…	…
N	Candidate 1	1	0	1