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electsys21

Voting Methods for Ranked, Rated and Approval Ballots

electsys21 is an R package that determines election winners using a range of voting methods. The functions accept several ballot formats — rankings, cardinal utilities (scores) and approvals — with automatic detection of the input type, configurable tie-breaking and tidy summaries of the results.

Installation

You can install the development version from GitHub with:

# install.packages("devtools")
devtools::install_github("ivan-ih21/electsys21")

Quick start

library(electsys21)

# Generate 20 ranking ballots over 4 candidates
ballots <- gen_ranks(n_voters = 20, n_candidates = 4, seed = 1)

# Run a First-Past-The-Post election
fptp(ballots)

Every method returns a result object; print it or call summary() on it for a formatted results table.

Voting methods

Function	Method
`fptp()`	First-Past-The-Post
`tworound()`	Two-Round System
`irv()`	Instant-Runoff Voting
`borda()`	Borda Count
`condorcet()`	Condorcet Method
`approval()`	Approval Voting
`majority_judgement()`	Majority Judgment
`d21()`	D21 Method
`d21_minus()`	D21 Method with minus votes

Ballot formats

The voting functions accept a matrix (or data frame) with one row per voter and one column per candidate. Three input types are recognised and detected automatically (or set explicitly via type):

rank — integer ranks, 1 = most preferred;
utility — cardinal scores, higher = more preferred;
approval — a logical or {0, 1} matrix.

majority_judgement() additionally accepts a score type, where each entry is treated directly as an integer grade.

The helpers gen_ranks(), gen_utilities() and gen_approvals() generate random ballots for testing and demonstration.

License

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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