{
  "slug": "absolute-top-impression-share-lost-to-rank",
  "name": "Absolute top impression share lost to rank",
  "aliases": [
    "Rank-lost absolute top IS"
  ],
  "definition": "The share of available auction impressions in the first ad slot that you did not receive because your ad rank was too low.",
  "category": "Paid search",
  "type": "share",
  "unit": "share of available auction impressions (stored 0 to 1, shown as a percent)",
  "direction": "neutral",
  "verification": "review",
  "aggregation": "An unweighted average across keyword-day rows.",
  "grain": "One number per segment and date range, or one row per keyword or campaign.",
  "dimensions": [
    "keyword",
    "campaign_name"
  ],
  "requiredFilters": [
    "segment_id",
    "date_range"
  ],
  "sources": [
    "google-ads"
  ],
  "reports": [],
  "skills": [
    "paid-efficiency-review"
  ],
  "verbs": [
    "paid_impression_share"
  ],
  "rungs": [
    "R2"
  ],
  "levers": [
    "L8"
  ],
  "questions": [
    "Are we losing the first ad slot to rank?"
  ],
  "caveats": [
    "The semantic layer averages Google Ads' own per-row rank-lost absolute-top share; nothing is recomputed here.",
    "Rank-lost only, the budget-lost equivalent is not measured on this dataset.",
    "The response key drops the rank qualifier; carry it in the sentence.",
    "Always per segment; unweighted average across rows; stored as a fraction between 0 and 1."
  ],
  "freshness": "~1 day behind, Ads reporting settles overnight; same-day spend is provisional.",
  "failureModes": [
    "Treating this as total lost first-slot coverage.",
    "Reading a rise in this number as an improvement because a direction oracle painted it green."
  ],
  "notSameAs": [
    {
      "slug": "absolute-top-impression-share",
      "why": "One is the first slot you won; this is the first slot you lost on rank. Separate columns, not complements."
    }
  ],
  "related": [
    "impression-share-lost-to-rank",
    "absolute-top-impression-share"
  ],
  "workflows": [],
  "lastVerified": "2026-08-04"
}