Collections

PrefLib users tend to be interested in similar sets of files. On this page, we provide pre-compiled collections of files. If the set of files is not available here, use the preflibtools to generate your own collection.

Important: By using automatically-generated collections of files, you lose the fine-grained understanding of the files in the collection (e.g., the provenance of the data). Keep that in mind as this can impact your results.

Data Type

Strict Order Complete (SOC)

Strict order complete files encode preferences in which all respondents submitted a strict ranking containing all the alternatives.

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Strict Order Incomplete (SOI)

Strict order incomplete files encode preferences in which all respondents submitted a strict ranking containing some of the alternatives.

This collection also includes the SOC files since they are a special case of SOI.

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Tie Order Complete (TOC)

Strict order complete files encode preferences in which all respondents submitted a ranking containing all the alternatives where ties between alternatives are allowed.

This collection also includes the SOC files since they are a special case of TOC.

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Tie Order Incomplete (TOI)

Strict order incomplete files encode preferences in which all respondents submitted a strict ranking containing some of the alternatives where ties between alternatives are allowed.

This collection also includes the SOC, SOI and TOC files since they are a special case of TOI.

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Categorical (CAT)

Categorical files encode preferences in which all respondents classified some of the alternatives in categories. The categories are themselves globally ordered which defines preferences.

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Weighted Matching Data (WMD)

Weighted matching data files encode preferences that are seen as a weighted directed graphs, i.e., a collection of edges between the alternatives associated with a weight.

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Modification Type

Original Files

"In original files the preferences appear exactly as they were submitted.

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Induced Files

In induced files the preferences have been induced from another context but not modified: the format differs but not the content.

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Imbued Files

In imbued files the preferences have been induced from another context and additional (arbitrary) information has been added.

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Synthetic Files

In synthetic files the preferences have been generated artificially.

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Structural Properties

Strict Preferences

In strict preferences files the respondents ordered the alternatives in a strict manner: no ties is allowed.

This should contain all SOC and SOI files (otherwise, there is a problem with the database).

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Complete Preferences

In complete preferences files the respondents reported their preferences for all the alternatives.

This should contain all SOC and TOC files, together with the CAT files that are complete.

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Approval Preferences

Approval files correspond to cases in which the preferences can be read as: each respondent approves of a given subset of alternatives. This includes:

  • Ordinal preferences with ties where each respondent submitted a single indifference class;
  • Ordinal preferences with ties where each respondent submitted two indifference classes containing all the alternatives;
  • Categorical preferences with 1 category;
  • Categorical preferences with 2 categories containing all the alternatives.
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Single-Peaked Preferences

Single-peaked files correspond to cases in which the alternatives can be arranged on a one-dimensional axis that is consistent with the preferences of all the respondents. Check the Wikipedia page for more information.

Disclaimer: This is computed on all SOC files, and the TOC files with no more than 15 alternatives. This collection may thus be incomplete.

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Single-Peaked on a Tree Preferences

Single-peaked on a tree files correspond to cases in which the alternatives can be arranged on a tree structure that is consistent with the preferences of all the respondents. Check this paper, Section 3.5, for more information.

Disclaimer: This is only computed on SOC files (all of them). This collection may thus be incomplete.

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Single-Crossing Preferences

Single-crossing files correspond to cases in which the preferences can be ordered in a one-dimensional manner. Check this paper, Section 3.3, for more information.

Disclaimer: This is only computed on SOC files (all of them). This collection may thus be incomplete.

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