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Parsimonious model for predicting mean cabinet duration on the basis of electoral system

  • Author(s): Taagepera, R
  • Sikk, A
  • et al.
Abstract

This study joins two existing logical models and tests the resulting predictions of mean cabinet duration (C). One of these models predicts C based on effective number of parties (N): C = k/N2, where k is found to be around 42 years. The other predicts N on the basis of number of seats in the assembly (S) and district magnitude (M). The new combined model leads to a prediction for the mean cabinet duration in terms of these two institutional factors: C = 42 years/(MS)1/3. Three-quarters of the actual mean durations agree with the prediction within a factor of 2. For the purposes of institutional engineering, the model predicts that doubling the district magnitude would reduce the mean cabinet duration by 21 percent ceteris paribus. © 2010 SAGE Publications.

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