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107 lines
2.6 KiB
107 lines
2.6 KiB
# Motion Semantic Drift Analysis Report
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**Windows analyzed:** 2016, 2017, 2018, 2019, 2022, 2023, 2024, 2025, 2026
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**Top N motions per axis:** 20
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---
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## Summary
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- **Stable axes:** [1, 2, 3, 4, 5, 7, 8, 9, 10]
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- **Axes with inflection points:** 1
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- **Parties with cross-ideological voting:** 0
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## Axis Stability
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**Stable axes (similarity > 0.7):** [1, 2, 3, 4, 5, 7, 8, 9, 10]
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**Reordered axes:** [6]
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**Unstable axes:** []
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## Semantic Drift
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### Axis 8 Inflection Points
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- **2016 → 2017**: drift=1.7467 (median=0.4850)
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- **2017 → 2018**: drift=1.7470 (median=0.4850)
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## Party Voting Analysis
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**Parties tracked:** 47
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No cross-ideological voting detected.
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## Overtone Shift
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Overtone shift measures how the semantic content of motions on each axis changes over time, even when party ordering stays the same.
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### Axis 1
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- **Average shift:** 1.4680
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- **Max shift:** 1.9709
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- **Inflection points:** 0
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### Axis 2
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- **Average shift:** 1.4220
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- **Max shift:** 1.7869
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- **Inflection points:** 0
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### Axis 3
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- **Average shift:** 1.3830
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- **Max shift:** 1.8293
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- **Inflection points:** 0
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### Axis 4
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- **Average shift:** 1.3946
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- **Max shift:** 1.8857
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- **Inflection points:** 0
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### Axis 5
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- **Average shift:** 1.4333
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- **Max shift:** 1.9253
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- **Inflection points:** 0
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### Axis 7
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- **Average shift:** 1.3068
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- **Max shift:** 1.8408
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- **Inflection points:** 0
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### Axis 8
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- **Average shift:** 1.3022
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- **Max shift:** 1.8897
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- **Inflection points:** 0
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### Axis 9
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- **Average shift:** 1.3751
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- **Max shift:** 1.9262
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- **Inflection points:** 0
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### Axis 10
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- **Average shift:** 1.2993
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- **Max shift:** 1.7220
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- **Inflection points:** 0
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## Methodology
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- **Axis stability:** Ridge regression weights (SVD_score ~ fused_embedding) per axis per window, compared via max(cosine similarity, Jaccard top-100 dimensions)
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- **Overtone shift:** Semantic gravity (weighted mean fused embedding) per axis per window, tracked via cosine distance between consecutive windows
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- **Semantic drift:** Cosine distance between fused embedding centroids of top-N motions per axis
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- **Inflection points:** Drift/shift rate exceeding 2× median rate
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- **Cross-ideological voting:** Parties voting 'voor' on motions where canonical opposite-wing parties have high loadings
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- **Semantic drift:** Cosine distance between fused embedding centroids of top-N motions per axis
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- **Inflection points:** Drift rate exceeding 2× median drift rate
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- **Cross-ideological voting:** Parties voting 'voor' on motions where canonical opposite-wing parties have high loadings
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