{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.calculatorx.com/schemas/engineering.conformity.z_prime/1.0.0/input.json",
  "title": "Proficiency-testing z′ — input",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "ylab": {
      "type": "number",
      "description": "Laboratory / participant result. Aliases: y, x."
    },
    "xref": {
      "type": "number",
      "description": "Assigned value x_pt. Aliases: X, ref."
    },
    "sigma": {
      "type": "number",
      "exclusiveMinimum": 0,
      "description": "Scheme SDPA σ_pt. Aliases: sigma_pt, sdpa, s_pt. Not laboratory u."
    },
    "u_xref": {
      "type": "number",
      "exclusiveMinimum": 0,
      "description": "Standard uncertainty of the assigned value u(x_pt). Aliases: u_xpt, uxpt, u_assigned. Not ulab."
    }
  },
  "required": [
    "ylab",
    "xref",
    "sigma",
    "u_xref"
  ],
  "description": "ISO 13528 z′ = (ylab−xref)/√(σ_pt²+u(x_pt)²). σ_pt and u(x_pt) must both be > 0 so this cannot wrap z-score. |z′| ≤ 2 pass, 2 < |z′| < 3 warning, |z′| ≥ 3 fail. Not z-score, not zeta, and not En. (calculation_version 1.0.0)"
}