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146 lines
4.5 KiB
146 lines
4.5 KiB
---
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title: Domain Glossary
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category: domain
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---
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# Domain Glossary - Dutch Political Terms
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## CRITICAL INVARIANTS
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> **Rule 1**: Centroid of right-wing parties on RIGHT side of ALL axes
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> - PVV, FVD, JA21, SGP centroid must appear on the RIGHT
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> - Individual right-wing parties may vary slightly from the centroid
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> - This is non-negotiable for any compass/axis visualization
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> **Rule 2**: SVD labels are empirically derived from voting data
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> - Labels represent WHAT THE DATA SHOWS, not party self-identification or public opinion
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> - Labels are derived from outliers and 20 representative motions (10 positive, 10 negative)
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> - See SVD Label Derivation section below
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---
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## SVD Label Derivation
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### The Process
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SVD (Singular Value Decomposition) finds axes that maximize variance in the MP × Motion voting matrix. To label each axis:
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1. **Identify outliers**: Find the two MPs with most extreme positions on that axis
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2. **Select representative motions**: Pick 20 motions where these outliers disagreed most sharply (10 they voted opposite on, 10 where both voted same direction but with other extremes)
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3. **Interpret theme**: Read the motion titles to derive what the axis represents
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4. **Assign label**: Label describes the empirical theme, could be:
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- Left-Right
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- Coalition-Opposition
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- Progressive-Conservative
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- EU-National sovereignty
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- Populist-Establishment
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- Or whatever the voting patterns show
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### Example
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| Step | Description |
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|------|-------------|
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| Outlier A | Wilders (PVV) - extreme positive on Dim 1 |
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| Outlier B | Marijnissen (SP) - extreme negative on Dim 1 |
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| 20 Motions | Immigration, integration, law & order themes dominate |
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| Label | "Links-Rechts" (Left-Right) |
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### Labeling Rules
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- **Never use party names in labels** (e.g., not "PVV-SP axis")
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- **Never use semantic/ideological labels** (e.g., not "progressive-conservative" unless that's what the motions show)
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- **Use motion-derived themes** (e.g., "Immigration", "EU", "Economy")
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- **Fallback**: If theme is unclear, use "Axis 1", "Axis 2"
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---
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## Core Entities
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### Motion / Motie
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- Parliamentary motion submitted by MPs
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- Fields: `id`, `title`, `date`, `category`
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- MPs vote: **For** (+1), **Against** (-1), **Abstain** (0), **Absent**
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### MP / Kamerlid
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- Member of Parliament (Tweede Kamerlid)
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- Identified by full name (e.g., "Van Dijk, I.")
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- Has voting record, party affiliation, SVD position vector
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### Party / Fractie
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- Political party (e.g., "GroenLinks-PvdA", "PVV", "VVD")
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- Party centroids: average SVD position of all MPs in party
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### Vote / Stemming
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- Individual MP's vote on a motion: +1, 0, -1
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- Aggregated to compute SVD vectors
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---
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## Time & Analysis Concepts
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### Window / Tijdsvenster
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- Time period for analysis (annual or quarterly)
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- Values: "2023", "2023-Q1", "2024", etc.
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- SVD vectors computed per window
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### Trajectory
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- MP's position change across multiple windows
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- Computed from `svd_vectors` + window ordering
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---
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## Mathematical / Algorithmic Terms
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### SVD Vector
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- 2D vector from Singular Value Decomposition of MP × Motion vote matrix
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- Represents MP's position in political space
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### SVD Label
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- Empirically derived axis label based on outlier MPs and representative motions
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- Describes the theme of disagreement on that axis
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- NOT based on party ideology or semantic labels
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### Political Compass
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- 2D visualization with SVD axes mapped to compass quadrants
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- X-axis: First SVD dimension (labeled from voting data)
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- Y-axis: Second SVD dimension (labeled from voting data)
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### Procrustes Alignment
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- Algorithm to align SVD vectors across time windows
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- Ensures comparable positions across years/quarters
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### UMAP
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- Uniform Manifold Approximation and Projection
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- Dimensionality reduction for visualization
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- Optional dependency with graceful SVD fallback
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---
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## Database Table Reference
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| Table | Key Fields |
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|-------|-----------|
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| `motions` | id, title, date, category |
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| `mp_votes` | mp_id, motion_id, vote |
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| `svd_vectors` | entity_id, window, vector_2d (list[2]) |
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| `mp_party_history` | mp_id, party, start_date, end_date |
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| `windows` | window_id, start_date, end_date, period_type |
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| `mp_trajectories` | mp_id, window, trajectory_vector |
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---
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## Dutch Political Parties
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### Canonical Right-Wing (centroid on RIGHT of axes)
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- PVV (Partij voor de Vrijheid)
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- FVD (Forum voor Democratie)
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- JA21
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- SGP (Staatkundig Gereformeerde Partij)
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### Other Major Parties
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- VVD (Volkspartij voor Vrijheid en Democratie)
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- GL-PvdA (GroenLinks-PvdA)
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- NSC (Nieuw Sociaal Contract)
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- BBB (BoerBurgerBeweging)
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- SP (Socialistische Partij)
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- D66 (Democraten 66)
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