{
  "metric_id": "congress_cross_party_cosponsorship",
  "primary": "cbs_offer_out_party_original_cosponsorship_rate \u2192 chamber\u00d7congress mean of offer_aggregate_unweighted",
  "tag": "cross-party cooperation (native units) \u2014 distinct data family from roll-calls",
  "status": "RESEARCH ONLY \u2014 descriptive pull; no inversion; no composite; no E2/L1/M1 scoring",
  "authorization": "Codex f282102b CONDITIONAL_ACCEPT_RESEARCH_PULL",
  "source": {
    "package": "biparty (GitHub congressional-bipartisanship-scores/biparty)",
    "file": "data/aggregate.cbs.rda",
    "url": "https://raw.githubusercontent.com/congressional-bipartisanship-scores/biparty/main/data/aggregate.cbs.rda",
    "sha256": "e8a0a9662963e2705382ea0be3a5f69e0aa9b048bf5c81ae75386861f407d23b",
    "bytes": 369660,
    "paper_pdf": "https://thelawmakers.org/wp-content/uploads/2026/06/DobsonLollis_CEL_202602.pdf",
    "paper_pdf_sha256": "c9a5ec5c568eef2f32dfef593914ba0194ecb27abc482581f6364f9b8b2b779f",
    "writeup": "https://thelawmakers.org/legislative-research/congressional-bipartisanship-scores-by-member-and-issue-area-1983-2024",
    "n_rows": 11549,
    "coverage": "98\u2013118 Congress"
  },
  "direction": {
    "coding": "NATIVE cooperation proportions; higher offer/attract = more cross-party activity",
    "no_inversion_this_pull": true,
    "fracture_proxy_deferred": "1\u2212offer only if a later named memo explicitly defines it"
  },
  "house_offer_unweighted": {
    "n": 21,
    "first_cong": 98,
    "last_cong": 118,
    "first": 0.297526,
    "last": 0.158502,
    "min": 0.150515,
    "max": 0.297526,
    "mean": 0.22190590476190475,
    "delta_first_last": -0.139024,
    "last5_mean": 0.17764280000000002,
    "first5_mean": 0.2837544
  },
  "senate_offer_unweighted": {
    "n": 21,
    "first_cong": 98,
    "last_cong": 118,
    "first": 0.355564,
    "last": 0.241861,
    "min": 0.221839,
    "max": 0.365684,
    "mean": 0.29806580952380957,
    "delta_first_last": -0.113703,
    "last5_mean": 0.248813,
    "first5_mean": 0.3390228
  },
  "house_attract_unweighted": {
    "n": 21,
    "first_cong": 98,
    "last_cong": 118,
    "first": 0.358697,
    "last": 0.375611,
    "min": 0.296663,
    "max": 0.398047,
    "mean": 0.33944585714285713,
    "delta_first_last": 0.016913999999999985,
    "last5_mean": 0.37532319999999997,
    "first5_mean": 0.34557580000000004
  },
  "senate_attract_unweighted": {
    "n": 21,
    "first_cong": 98,
    "last_cong": 118,
    "first": 0.385532,
    "last": 0.424813,
    "min": 0.334034,
    "max": 0.443838,
    "mean": 0.39414338095238094,
    "delta_first_last": 0.03928100000000001,
    "last5_mean": 0.4259412,
    "first5_mean": 0.382171
  },
  "recent_house_tail": [
    {
      "congress": 114,
      "chamber": "HOUSE",
      "n_members": 446,
      "mean_offer_unweighted": 0.178473,
      "n_offer_unweighted": 445,
      "mean_attract_unweighted": 0.374994,
      "n_attract_unweighted": 435,
      "mean_offer_weighted": 0.179484,
      "n_offer_weighted": 445,
      "mean_attract_weighted": 0.374289,
      "n_attract_weighted": 435,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 115,
      "chamber": "HOUSE",
      "n_members": 453,
      "mean_offer_unweighted": 0.183217,
      "n_offer_unweighted": 448,
      "mean_attract_unweighted": 0.391591,
      "n_attract_unweighted": 442,
      "mean_offer_weighted": 0.183406,
      "n_offer_weighted": 448,
      "mean_attract_weighted": 0.391085,
      "n_attract_weighted": 442,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 116,
      "chamber": "HOUSE",
      "n_members": 449,
      "mean_offer_unweighted": 0.217507,
      "n_offer_unweighted": 447,
      "mean_attract_unweighted": 0.398047,
      "n_attract_unweighted": 437,
      "mean_offer_weighted": 0.215297,
      "n_offer_weighted": 447,
      "mean_attract_weighted": 0.396093,
      "n_attract_weighted": 437,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 117,
      "chamber": "HOUSE",
      "n_members": 454,
      "mean_offer_unweighted": 0.150515,
      "n_offer_unweighted": 453,
      "mean_attract_unweighted": 0.336373,
      "n_attract_unweighted": 444,
      "mean_offer_weighted": 0.149562,
      "n_offer_weighted": 453,
      "mean_attract_weighted": 0.338184,
      "n_attract_weighted": 444,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 118,
      "chamber": "HOUSE",
      "n_members": 451,
      "mean_offer_unweighted": 0.158502,
      "n_offer_unweighted": 451,
      "mean_attract_unweighted": 0.375611,
      "n_attract_unweighted": 441,
      "mean_offer_weighted": 0.157912,
      "n_offer_weighted": 451,
      "mean_attract_weighted": 0.375929,
      "n_attract_weighted": 441,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    }
  ],
  "recent_senate_tail": [
    {
      "congress": 114,
      "chamber": "SENATE",
      "n_members": 100,
      "mean_offer_unweighted": 0.246381,
      "n_offer_unweighted": 100,
      "mean_attract_unweighted": 0.420605,
      "n_attract_unweighted": 100,
      "mean_offer_weighted": 0.247367,
      "n_offer_weighted": 100,
      "mean_attract_weighted": 0.418227,
      "n_attract_weighted": 100,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 115,
      "chamber": "SENATE",
      "n_members": 105,
      "mean_offer_unweighted": 0.267408,
      "n_offer_unweighted": 104,
      "mean_attract_unweighted": 0.438846,
      "n_attract_unweighted": 101,
      "mean_offer_weighted": 0.270452,
      "n_offer_weighted": 104,
      "mean_attract_weighted": 0.44435,
      "n_attract_weighted": 101,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 116,
      "chamber": "SENATE",
      "n_members": 102,
      "mean_offer_unweighted": 0.255592,
      "n_offer_unweighted": 101,
      "mean_attract_unweighted": 0.443838,
      "n_attract_unweighted": 101,
      "mean_offer_weighted": 0.255838,
      "n_offer_weighted": 101,
      "mean_attract_weighted": 0.439638,
      "n_attract_weighted": 101,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 117,
      "chamber": "SENATE",
      "n_members": 100,
      "mean_offer_unweighted": 0.232823,
      "n_offer_unweighted": 100,
      "mean_attract_unweighted": 0.401604,
      "n_attract_unweighted": 100,
      "mean_offer_weighted": 0.233411,
      "n_offer_weighted": 100,
      "mean_attract_weighted": 0.406434,
      "n_attract_weighted": 100,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    },
    {
      "congress": 118,
      "chamber": "SENATE",
      "n_members": 103,
      "mean_offer_unweighted": 0.241861,
      "n_offer_unweighted": 103,
      "mean_attract_unweighted": 0.424813,
      "n_attract_unweighted": 102,
      "mean_offer_weighted": 0.240425,
      "n_offer_weighted": 103,
      "mean_attract_weighted": 0.429569,
      "n_attract_weighted": 102,
      "primary_metric": "mean_offer_unweighted",
      "unit": "cooperation_proportion_0_to_1",
      "inverted": false
    }
  ],
  "lineage_A_congress_gov_blocker": "API_KEY_MISSING \u2014 raw subset replication deferred until private key available",
  "csv": "/workspace/srp-observatory/data/e2/cbs_chamber_congress_offer_attract.csv",
  "csv_sha256": "b063f0d11462b2ca23ae6d46e6e07534dd1cdb33ed49ba57cbba5951d6f4d762",
  "computed_at_utc": "2026-09-09T21:43:40.549240+00:00"
}