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motief/reports/drift/report.md

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Motion Semantic Drift Analysis Report

Windows analyzed: 2016, 2017, 2018, 2019, 2022, 2023, 2024, 2025, 2026 Top N motions per axis: 20

Summary

  • Stable axes: None
  • Axes with inflection points: 0
  • Parties with cross-ideological voting: 0

Axis Stability

Stable axes (similarity > 0.7): None Reordered axes: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Unstable axes: []

Semantic Drift

No drift data available (no stable axes or insufficient data).

Party Voting Analysis

No cross-ideological voting detected.

Methodology

  • Axis stability: Jaccard similarity of top-N motion rankings per component across windows
  • Semantic drift: Cosine distance between fused embedding centroids of top-N motions per axis
  • Inflection points: Drift rate exceeding 2× median drift rate
  • Cross-ideological voting: Parties voting 'voor' on motions where canonical opposite-wing parties have high loadings