{
  "specification_version": "3.4.0",
  "source_document_revision": "AHj4eMT9yK21YUzFwGGh-vnHaxeOM8sbBtiC8OSfCm71Y1VYtWxOuiy2SG3GJI-8WRSfEwjhtEaCMBLoCWf40ZnyE823r9u8RkNjxBh2Qg",
  "table": "Category 2: Combined probabilities of Household + Individual rules (section III.C.4)",
  "columns": [
    "Household leg",
    "Individual leg",
    "Combined P(collision)"
  ],
  "rows": [
    {
      "Household leg": "H-01 (SSN Last 4 + Phone)",
      "Individual leg": "I-01 (First Name + DOB); Last Name retained as non-scored corroboration",
      "Combined P(collision)": "2.0e-16"
    },
    {
      "Household leg": "H-04 (ITIN Last 4 + Phone)",
      "Individual leg": "I-01 (First Name + DOB); Last Name retained as non-scored corroboration",
      "Combined P(collision)": "2.0e-16"
    },
    {
      "Household leg": "H-02 (SSN Last 4 + Email)",
      "Individual leg": "I-01 (First Name + DOB); Last Name* retained as non-scored corroboration",
      "Combined P(collision)": "2.0e-16"
    },
    {
      "Household leg": "H-05 (ITIN Last 4 + Email)",
      "Individual leg": "I-01 (First Name + DOB); Last Name* retained as non-scored corroboration",
      "Combined P(collision)": "2.0e-16"
    },
    {
      "Household leg": "H-12 (Phone + ZIP)",
      "Individual leg": "I-01 (First Name + DOB)",
      "Combined P(collision)": "6.0e-16"
    },
    {
      "Household leg": "H-13 (Email + ZIP)",
      "Individual leg": "I-01 (First Name + DOB)",
      "Combined P(collision)": "6.0e-16"
    },
    {
      "Household leg": "H-14 (Phone + Street Line)",
      "Individual leg": "I-01 (First Name + DOB)",
      "Combined P(collision)": "6.0e-17"
    },
    {
      "Household leg": "H-07 (Subscriber ID + Phone)",
      "Individual leg": "I-01 (First Name + DOB)",
      "Combined P(collision)": "2.0e-16"
    },
    {
      "Household leg": "Guardian's identity (independently matched under Table 2) + Street Line",
      "Individual leg": "Relationship Linkage, clinical (child-of guardian) + First Name + DOB",
      "Combined P(collision)": "≈6e-13 (flat product: 0.02 × 0.0001 × 0.01 × 0.00003) — flagged: Street Line is correlated with the relationship term (same household address), so this overstates the margin; needs a dependency discount or drop Street Line before adoption"
    },
    {
      "Household leg": "Mother's identity (independently matched under Table 2)",
      "Individual leg": "Relationship Linkage, clinical (newborn-of mother) + DOB + per-encounter namespace-bound birth-encounter ID",
      "Combined P(collision)": "Clears with wide margin if the birth-encounter ID is a true per-encounter unique identifier — does not clear if only a shared facility ID is available; a facility ID is far above the threshold"
    }
  ]
}