QoG Data

UCDP Dyadic Dataset 25.1

The UCDP Dyadic Dataset is a project within the Uppsala Conflict Data Program (UCDP) at the Department of Peace and Conflict Research, Uppsala University.

The UCDP Dyadic dataset builds on the UCDP/PRIO Armed Conflict dataset, but goes beyond the conflict level and focuses on dyads within each conflict. As such, it constitutes a disaggregated version of the UCDP/PRIO Armed Conflict dataset.

A dyad consists of two opposing actors in an armed conflict where at least one party is the government of a state. For the purpose of the QoG compilation, we have transformed the data so we can have a country-year identification. Please find the original format of the dataset at https://ucdp.uu.se/downloads/

Dataset type

Other

Dataset level

Country

Last updated by source

2025-03-31

Citation

When using this dataset, please cite as:

• Davies, S., Engström, G., Pettersson, T., & Öberg, M. (2024). Organized violence 1989-2023 and the return of conflicts between states? Journal of Peace Research, 61(4).

• Harbom, L., Melander, E., & Wallensteen, P. (2008). Dyadic dimensions of armed conflict. Journal of Peace Research, 45(5), 697–710.

• Pettersson, T. (2024). UCDP Dyadic Dataset Codebook v 24.1. https://ucdp.uu.se/downloads/

@article{ucdp1,
 author = {Davies, Shawn and Pettersson, Therese and Sollenberg, M. and Öberg, Magnus},
 journal = {Journal of Peace Research},
 last_updated = {2024-12-10},
 number = {4},
 title = {Organized violence 1989–2024, and the challenges of identifying civilian victims},
 volume = {62},
 year = {2025}
}

@article{ucdp2,
 author = {Harbom, Lotta and Melander, Erik and Wallensteen, Peter},
 journal = {Journal of Peace Research},
 last_updated = {2024-12-10},
 number = {5},
 pages = {697--710},
 title = {Dyadic Dimensions of Armed Conflict},
 volume = {45},
 year = {2008}
}

@misc{ucdp3,
 author = {Pettersson, Therese},
 last_updated = {2025-12-03},
 title = {{UCDP Dyadic Dataset Codebook v 25.1}},
 url = {https://ucdp.uu.se/downloads/},
 year = {2025}
}

Variables in this dataset

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Number of extrasystemic armed conflicts

QoG code: ucdp_type1

Number of extrasystemic armed conflicts per country in a given year. Extrasystemic armed conflict occurs between a state and a non-state group outside its own territory. (In the COW project, extrasyst ...

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Number of interstate armed conflicts

QoG code: ucdp_type2

Number of interstate armed conflicts per country in a given year. An interstate armed conflict occurs between two or more states.

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Number of internal armed conflicts

QoG code: ucdp_type3

Number of internal armed conflicts per country in a given year. Internal armed conflict occurs between the government of a state and one or more internal opposition group(s) without intervention from ...

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Number of internationalized internal armed conflicts

QoG code: ucdp_type4

Number of internationalized internal armed conflicts per country in a given year. An internationalized internal armed conflict occurs between the government of a state and one or more internal opposit ...

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