{
    "dataset": "AI Search Visibility in Italia",
    "panel_version": "it-ai-search-v1.0",
    "public_metrics_version": "research-public-metrics-v1.1",
    "primary_source_comparison_engines": [
        "chatgpt",
        "gemini",
        "google_ai_overview"
    ],
    "google_ai_mode": {
        "answer_analysis": "valid",
        "brand_analysis": "valid",
        "surface_analysis": "valid",
        "search_source_presence": "valid_with_caveat",
        "citation_rate_cross_replicate": "excluded",
        "domain_ranking_cross_replicate": "excluded",
        "source_divergence_cross_replicate": "excluded",
        "reason": "Provider instrumentation discontinuity: raw citations became populated at a radically different rate in replicate 3 while collector/model/methodology versions and links_attached behavior remained stable.",
        "instrumentation_by_replicate": [
            {
                "replicate_no": 1,
                "responses": 500,
                "raw_with_citations": 21,
                "raw_citation_rows": 30,
                "with_links_attached": 444,
                "links_attached_rows": 2967
            },
            {
                "replicate_no": 2,
                "responses": 500,
                "raw_with_citations": 21,
                "raw_citation_rows": 56,
                "with_links_attached": 449,
                "links_attached_rows": 3018
            },
            {
                "replicate_no": 3,
                "responses": 500,
                "raw_with_citations": 433,
                "raw_citation_rows": 2353,
                "with_links_attached": 440,
                "links_attached_rows": 2955
            }
        ],
        "identical_answer_proof": {
            "identical_all_three": 60,
            "citations_appear_only_run3": 51,
            "same_citation_count": 3
        },
        "answer_html_source_reconstruction": "rejected because extracted hrefs include Google interface/navigation links and are not a source-only representation"
    },
    "ai_source_divergence": {
        "formula": "1 - Jaccard",
        "primary_population": "prompt-replicate comparisons where both engines have at least one attributable source domain",
        "reason": "Separates source-choice divergence from source-coverage differences.",
        "one_engine_empty": "reported separately, not included in primary mean",
        "both_engines_empty": "undefined and excluded"
    },
    "created_at": "2026-09-05T00:39:50+00:00"
}