{
  "workId": "fixed-broadband-internet-use-four-countries",
  "version": "1.0",
  "evidenceCheckedThrough": "2026-10-12",
  "analyticalWindow": "2021–2023",
  "contextWindow": "2010–2024 available observations; 2025 missing cells retained",
  "grain": "country × indicator × year",
  "indicators": {
    "IT.NET.BBND.P2": {
      "unit": "subscriptions per 100 people",
      "object": "Fixed internet subscriptions, residential and organisational",
      "interpretation": "Source-published subscription density",
      "excludedInterpretations": [
        "Unique people",
        "Household adoption",
        "Current delivered speed",
        "Composite access score"
      ],
      "threshold": "Advertised downstream speed at least 256 kbit/s",
      "includedTechnologies": "Cable, DSL, fibre to home/building, other fixed wired, satellite and terrestrial fixed wireless under the source definition",
      "exclusion": "Subscriptions via mobile-cellular networks excluded under the source note; national classifications may differ",
      "definitionCaution": "The WDI glossary also contains conflicting generic wireless wording; the precise national series boundary must be inspected rather than inferred"
    },
    "IT.NET.USER.ZS": {
      "unit": "percent of source-published population",
      "object": "Individuals using the internet",
      "genericRecall": "preceding three months",
      "countryException": "Historical national notes show differing ages and recall periods; current row-level notes were not established",
      "excludedInterpretations": [
        "Fixed-network use",
        "Unique active broadband customers",
        "Fully equivalent national raw samples"
      ]
    }
  },
  "nationalSources": {
    "dcs-annual-2025": {
      "population": "Sri Lankan household population ages 5–69",
      "recall": "at least once in the preceding twelve months",
      "weighting": "2025 annual estimates reweighted using the 2024 Census; cross-year changes may include reweighting effects",
      "uncertainty": "Rounded point estimates; no significance test"
    },
    "trc-q2-2026": {
      "object": "Reported national fixed and mobile broadband subscriptions",
      "break": "2025 fixed reduction explicitly attributed to reporting error by Dialog Broadband Networks; cannot read as pure customer loss",
      "reconciliation": "Earlier national counts / WDI density relationship unresolved; no series splicing"
    },
    "japan-household-use": {
      "population": "Eligible households with head aged 20 or above on 1 April 2025",
      "individualModule": "Separate individual module covers household members aged six or above",
      "object": "At least one household member used the internet in the past year",
      "qualification": "Head age group is not an individual age group"
    },
    "japan-household-connections": {
      "population": "Households with at least one past-year internet user",
      "object": "Reported home connection types",
      "qualification": "Overlapping multiple responses; not all-household shares"
    }
  },
  "formulae": {
    "absoluteChange": "end − start",
    "nationalGap": "rounded estimate A − rounded estimate B",
    "countPercentChange": "(end − start) / start × 100",
    "overlapLowerBound": "max(0, fixed percentage + mobile percentage − 100) within the reported weighted conditional survey distribution; no confidence bound for the true population is estimated",
    "overlapRounding": "48.1% from displayed marginals; 48.0% conservative lower bound if each marginal is conventionally rounded to nearest 0.1; prose says at least about 48%"
  },
  "missingData": "Retain blank value plus missing=true; no interpolation or forward fill",
  "rights": "ITU/WDI numeric series: CC BY 4.0. Other source publications retain their own rights. Original analysis and figure licence follows the accepted work release.",
  "maintenance": {
    "firstOperationalCheckpoint": "26 October 2026 if published before that date; otherwise 14 days after actual release",
    "earlierTriggers": [
      "Admitted WDI value or definition revision",
      "Relevant national release",
      "Accepted Japan-source correction"
    ],
    "futureOfficialWindow": "December ITU household-statistics window requires current calendar confirmation; no fixed day claimed",
    "automation": "No unattended schedule"
  }
}