dataset_id: jp-election-db.derived-extraction-data
family: "prefecture-series"
dataset: "comparison-stats"
source_release_version: "2026-05-04-v051"
source_layer: "Layer 2 Release Facts"
primary_selector_field: "prefecture_code"
primary_selector_index_dir: "by-prefecture"
row_grain: "comparison_key x prefecture_code x component_family"
built_at: "2026-06-13T13:05:55Z"
notes: "Non-canonical prefecture comparison statistics built deterministically from Layer 2 by-election facts for explicit cross-election comparisons."
source_election_set_keys:
  - "20250720_hc"
  - "20260208_hr"
files:
  - artifact_id: latest_nationwide
    path: products/jp-election/derived/extraction/prefecture-series/comparison-stats/latest/nationwide.csv
    sha256: 4d0814e509842af6751c2fb15241a57674aa31c72534d3908c34ae10b25ee043
    size_bytes: 30242
    row_count: 94
    notes: "Stable latest nationwide CSV."
summary:
  primary_selector_field: "prefecture_code"
  primary_selector_index_dir: "by-prefecture"
  selector_file_count: 47