Effective number of parties (seats; Laakso & Taagepera 1979)
| Quick info | |
|---|---|
| Data type | Numeric |
| Scale | Metric |
| Value labels | Not applicable |
| Technical name | polnat_politics_laaktaag_seats |
| Category | Political factors |
| Label | Effective number of parties based on seat share (Laakso & Taagepera 1979) |
| Related indicators |
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This indicator displays the effective number of parties in the 1st or lower legislative chamber based on seat share according to the estimation formula proposed by Laakso and Taagepera 1979.
Coding rules
- If the total seat share of an election covered in the sources was < 60%, the effective number of parties is not estimated as it tends to be heavily distorted.
- According to V-Party's (Lührmann et al. 2020) and Elections Global' (Döring and Düpont 2020) coding rules only parties with a vote share >= 5% are included. This may slightly alter the estimate compared to other data collections that try capturing parties down to the promille level. However, the issue is less relevant for this indicator based on the seat share because parties with a vote share >= 5% usually are among the smaller ones in parliament and the total seat share covered is always higher than the total vote share per election in the sources.
- Missing countries in V-Party are complemented by data from Elections Global.
- Data is available for election years only.
Bibliographic info
Citation: Laakso, Markku, and Rein Taagepera. 1979. "'Effective' Number of Parties." Comparative Political Studies 12 (1): 3–27. https://doi.org/10.1177/001041407901200101
Related publications:- Döring, Holger, and Nils Düpont. 2020. "Elections Global: Election results in 207 countries, 1880–2015". Harvard Dataverse, V2. https://doi.org/10.7910/DVN/OGOURC
- Lührmann, Anna, Nils Düpont, Masaaki Higashijima, Yaman Berker Kavasoglu, Kyle L. Marquardt, Michael Bernhard, Holger Döring, Allen Hicken, Melis Laebens, Staffan I. Lindberg, Juraj Medzihorsky, Anja Neundorf, Ora John Reuter, Saskia Ruth–Lovell, Keith R. Weghorst, Nina Wiesehomeier, Joseph Wright, Nazifa Alizada, Paul Bederke, Lisa Gastaldi, Sandra Grahn, Garry Hindle, Nina Ilchenko, Johannes von Römer, Steven Wilson, Daniel Pemstein, and Brigitte Seim. 2020. "Codebook Varieties of Party Identity and Organisation (V–Party) V1". Varieties of Democracy (V–Dem) Project.
Misc
Project manager(s): Nils Düpont (A01)
Data release:- Version 0.001: Initial release
Revisions: No revisions yet
Sources
- Döring, Holger, and Nils Düpont. 2020. "Elections Global: Election results in 207 countries, 1880–2015". Harvard Dataverse, V2. https://doi.org/10.7910/DVN/OGOURC
- Lührmann, Anna, Nils Düpont, Masaaki Higashijima, Yaman B. Kavasoglu, Kyle L. Marquardt, Michael Bernhard, Holger Döring, Allen Hicken, Melis Laebens, Staffan I. Lindberg, Anja Neundorf, Saskia Ruth, Keith R. Weghorst, Nina Wiesehomeier, Joseph Wright, Ora J. Reuter, Nazifa Alizada, Paul Bederke, Lisa Gastaldi, Sandra Grahn, Garry Hindle, Nina Ilchenko, Johannes von Römer, Daniel Pemstein, and Brigitte Seim. 2020. "Varieties of Party Identity and Organization (V-Party) Dataset V1". Göteborg: Varieties of Democracy (V-Dem) Project. https://doi.org/10.23696/vpartydsv1
