{
    "id": "ETF-030",
    "category": "ETF",
    "title": "ETF 持倉多樣性指數",
    "question": "持倉數相近的基金，權重分散程度是否不同？",
    "chart": "scatter",
    "metric": "有效持股數（檔）",
    "secondary": "披露持股總數（檔）",
    "x": "披露持股總數（檔）",
    "y": "有效持股數（檔）",
    "panels": [
        "名義與有效持股數",
        "集中度分解",
        "披露覆蓋"
    ],
    "filters": [
        "基金類型",
        "比較基準",
        "顯示幣別"
    ],
    "apis": [
        "FUND"
    ],
    "calculation": "把完整長倉股票權重歸一化後計算有效持股數 1/Σwi²，對照 Holdings_Count。",
    "caveat": "僅限完整已披露普通長倉；缺持股、空頭及衍生品需另設口徑，不能強行歸一。",
    "data_class": "衍生",
    "complexity": "高",
    "audience": "進階",
    "reach": 8,
    "frequency": 6,
    "decision": 8,
    "clarity": 8,
    "sample_labels": [
        "高度集中",
        "中度集中",
        "廣泛分散",
        "覆蓋不足"
    ],
    "cadence": "每交易日收市後",
    "sample_note": "僅用於合成視覺示意，並非真實行情或投資成果。",
    "category_name": "ETF與基金",
    "score": 74.0,
    "requires_user_input": false,
    "requires_extra_plan": false,
    "source_urls": [
        "https://eodhd.com/financial-apis/stock-etfs-fundamental-data-feeds"
    ],
    "rank": 496,
    "stage": "P2",
    "svg_file": "mockups/0496-ETF-030.svg",
    "demo_fingerprint": "be71561f786ee0f5",
    "collection": "catalogue",
    "sample_annotation": {
        "sample": true,
        "as_of": "2026-10-16",
        "notice": "Charts and tables for this report are generated, deterministic synthetic sample observations for educational layout and unit demonstration only. No provider, market data or analysis engine is called, and nothing here is a statement about real securities.",
        "notice_zh": "此報告的圖表與數據為確定性生成的合成示例數據，僅供教育及版面展示；並無連接任何資料供應商或實際分析引擎，不代表任何真實證券的表現。",
        "default_filters": {
            "symbol": "0700.HK",
            "period": "1Y",
            "benchmark": "HSI"
        },
        "filters": {
            "symbol": [
                "0700.HK",
                "0005.HK",
                "AAPL.US",
                "MSFT.US",
                "SPY.US",
                "BTC-USD.CC"
            ],
            "period": [
                "1Y",
                "3Y",
                "5Y"
            ],
            "benchmark": [
                "HSI",
                "SPX",
                "BTC"
            ]
        },
        "library": {
            "version": "2026-10-19",
            "source": "https://chatgpt.com/share/6ad67223-c610-83e8-adb2-33aaf792e584",
            "sample": true
        }
    }
}