"My scheme is intended only for honest men." |

A quick bit of history. The man credited with inventing the Borda count is Jean-Charles de Borda. He invented a lot of things and has a crater on the moon named after him.

## How the Borda count works

The Borda count is really simple. Suppose 5 candidates are running in the election. The voters rank the candidates, and each candidate gets 4 points for every first choice, 3 points for every second choice, 2 points for every third choice, 1 point for every fourth choice, and no points for last choices. You count up the points, and the person with the most points wins.

Sometimes you will see other point systems. E.g., 5 points for a first choice and 1 point for a last choice. Sometimes it is reversed and you get 1 point for a first choice, 5 points for a last choice vote, and the person with the fewest points wins. You get the same winner either way so it doesn't matter.

## When to use the Borda count

The Borda count is especially useful when:

- there are a large number of candidates,
- the number of voters is relatively small compared to the number of candidates, or
- you need to rank all of the candidates instead of just picking a winner.

One good use of the Borda count is setting an agenda for a meeting. Suppose that 20 people are voting to rank 30 agenda items, and it is desired to get an ordered list of agenda items to address at the meeting. Using instant runoff voting for this kind of election might result in a lot of ties and might not produce a satisfactory rank ordering of all the agenda items (because many agenda item may get the same number of votes). With the Borda count, however, each first choice gets 30 points, each second choice gets 29 points and so forth. With 20 voters, ties are unlikely, and you will get a nice clear ordering of agenda items.

Although most people haven't heard of the Borda count, it is used for some very well known elections. The Borda count is used to elect the MLB Most Valuable Player award, the Heisman trophy, and the winner of the Eurovision Song Contest.

Suppose that five candidates are running for President, and that candidates A and B are easily the two front runners and they are virtually tied. Candidates C, D, and E are also running but they all have very low support.

A voter's honest choice may be that candidate A is her favorite and candidate B is her second favorite. This voter may be tempted, however, to rank candidate B last. This way, candidate B gets 0 point instead of 4 points and candidate A has a better chance of winning.

Now imagine that all of candidate A's supporters rank candidate B last, and all of candidate B's supporters rank candidate A last. A possible result is that both of them lose and instead candidate C wins who no one really liked anyway!

For this reason, the Borda count should only be used where the voters will likely vote honestly. When electing officers of an organization, the Borda count may not be a good choice (depends on your voters), but the Borda count may be a great choice for setting the agenda of your next meeting or casual decision making like selecting a restaurant for a group outing.

Although most people haven't heard of the Borda count, it is used for some very well known elections. The Borda count is used to elect the MLB Most Valuable Player award, the Heisman trophy, and the winner of the Eurovision Song Contest.

## What is this flaw?

The Borda count requires that voters vote honestly, and voters can manipulate the results by voting dishonestly. Monsieur de Borda is famous for having said "My scheme is intended only for honest men." We'll use an example to explain what it means to vote dishonestly...Suppose that five candidates are running for President, and that candidates A and B are easily the two front runners and they are virtually tied. Candidates C, D, and E are also running but they all have very low support.

A voter's honest choice may be that candidate A is her favorite and candidate B is her second favorite. This voter may be tempted, however, to rank candidate B last. This way, candidate B gets 0 point instead of 4 points and candidate A has a better chance of winning.

Now imagine that all of candidate A's supporters rank candidate B last, and all of candidate B's supporters rank candidate A last. A possible result is that both of them lose and instead candidate C wins who no one really liked anyway!

For this reason, the Borda count should only be used where the voters will likely vote honestly. When electing officers of an organization, the Borda count may not be a good choice (depends on your voters), but the Borda count may be a great choice for setting the agenda of your next meeting or casual decision making like selecting a restaurant for a group outing.

This form of voting is great when the consequence of A or B or C are minimal and arbitrary. But if A wants to tear B's house down to put a roadway in and B wants to tear A's house down to put in a high-rise apartment comples and C wants to tear both A's and B's house down so that he can build a mansion, who do you want to win by the use of this process?

ReplyDeleteTotally agree that Borda is not suited for some types of elections, but I don't think any election method would word for your proposed scenario!

DeleteHow appropriate is this to VERY small elections, like for example a board of 7 electing their officers?

ReplyDeleteThat's a tough one, but I think the Borda count is your best option.

Deletehow do you count truncated ballots? If there are five candidates and a voter only ranks one candidate do they get one point and the rest zero, or do they get five points and the rest four, or do they get five points and the rest 2.5.

ReplyDeleteFor our Counts, we have this as an option. See here: https://www.opavote.com/help/online-counts#c-options

Deleteso with ballot completion option the first candidate would get five points and all the others 4. and it is also possible not to have the ballot completion option so that the first candidate gets five and all the others zero.

DeleteWith ballot completion and 5 candidates, a first ranked candidate gets 4 points. The 4 unranked candidates split the remaining points and each get (3+2+1)/4 points. Without ballot completion, the unranked candidates get 0 points. Create a Count to try it yourself.

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