Metadata

We have annotated most of our data files to be able to have a more fine grain analysis of the data we host. This allow for instance to be able to have a more interesting search tool. For each data file, its metadata are presented in the page of the corresponding datapatch.

In the following we present all the metadata we are using. Note that they may not always be available as some of them require sophisticated computations and/or do not apply for all types of data.

Modification Type

Each data file is labeled as either Original, Induced, Imbued or Synthetic.

We encourage you to understand some of the impacts that making these assumptions can have, see, e.g. A Behavioral Perspective on Social Choice. Anna Popova, Michel Regenwetter, and Nicholas Mattei. Annals of Mathematics and Artificial Intelligence 68(1-3), 2013.

General Properties

Number Of Alternatives

The number of alternatives is the number of elements agents had to vote on. It is only available for data representing orderings of the alternatives.

Applies to: soc, soi, toc, toi, tog, mjg, wmg, pwg, wmd.

Number Of Voters

The number of voters is the number of ballots that were submitted. For weighted matching graphs

Applies to: soc, soi, toc, toi, tog, mjg, wmg, pwg, wmd, dat, csv.

Sum Of Vote Count

The sum of the weights of the ballots cast. See the data format page for more information.

Applies to: soc, soi, toc, toi, tog, mjg, wmg, pwg, wmd, dat, csv.

Number Of Unique Orders

The number of distinct ballots that were casts.

Applies to: soc, soi, toc, toi, tog, mjg, wmg, pwg, wmd, dat, csv.

Preference Structure

Strict Orders

A boolean value set to True if all the ballots that were cast represent strict linear orders.

Applies to: soc, soi, toc, toi.

Complete Orders

A boolean value set to True if all the ballots that were cast represent complete linear orders.

Applies to: soc, soi, toc, toi.

Approval Profile

A boolean value set to True if the ballots can be interpreted as approval ballots. That is the case if, either every ballot consist of a single set of indifferences, or every ballots is complete and consist of two set of indifferences.

Applies to: soc, soi, toc, toi.

Single-Peaked

A boolean value set to True if the set of ballots cast represents single-peaked preferences. To check this property, we used the code of Zack Fitzsimmons and Martin Lackner available on GitHub that we want to thank here.

Applies to: soc.

Single-Crossing

A boolean value set to True if the set of ballots cast represents single-crossing preferences.

Applies to: soc.

Ballot Structure

Size Of The Smallest Ballot

Given a set of ballots, how many alternatives have been submitted in the ballot with the smallest number of submitted alternatives. In data representing complete orders (SOC and TOC), this should be equal to the number of alternatives.

Applies to: soc, soi, toc, toi.

Size Of The Largest Ballot

Given a set of ballots, how many alternatives have been submitted in the ballot with the highest number of submitted alternatives. In data representing complete orders (SOC and TOC), this should be equal to the number of alternatives.

Applies to: soc, soi, toc, toi.

Minimum Number Of Indifferences

In a given ballot, an indifference is a position in the order such that more than one alternative is ranked at this position. Given a set of ballots, the minimum number of indifferences is the number of indifferences in the ballot with the smallest number of them. In data witout ties (SOC and SOI), this should be 0.

Applies to: soc, soi, toc, toi.

Maximum Number Of Indifferences

In a given ballot, an indifference is a position in the order such that more than one alternative is ranked at this position. Given a set of ballots, the maximum number of indifferences is the number of indifferences in the ballot with the highest number of them. In data witout ties (SOC and SOI), this should be 0.

Applies to: soc, soi, toc, toi.

Size Of The Smallest Indifference

In a given ballot, an indifference is a position in the order such that more than one alternative is ranked at this position. Given a set of ballots, the size of the largest indifference is the maximal number of alternatives which are tied in a ballot. In data witout ties (SOC and SOI), this should be 0.

Applies to: soc, soi, toc, toi.

Size Of The Largest Indifference

In a given ballot, an indifference is a position in the order such that more than one alternative is ranked at this position. Given a set of ballots, the size of the largest indifference is the maximal number of alternatives which are tied in a ballot. In data witout ties (SOC and SOI), this should be 0.

Applies to: soc, soi, toc, toi.