{
    "id": "EVT-016",
    "category": "EVT",
    "title": "拆股前後交易活躍度",
    "question": "拆股後交易活動是否真的增加？",
    "chart": "bar",
    "metric": "前後成交額近似變化（%）",
    "secondary": "股數成交與日振幅",
    "x": "事件前後窗口",
    "y": "前後成交額近似變化（%）",
    "panels": [
        "主圖：前後成交額近似變化（%），依事件前後窗口排列",
        "輔圖：股數成交與日振幅",
        "明細：拆股前後交易活躍度的資料列、觀測日期與缺值狀態"
    ],
    "filters": [
        "股票／上市市場",
        "事件日期與狀態",
        "排除事件日及窗口"
    ],
    "apis": [
        "SPLIT",
        "EOD"
    ],
    "calculation": "用close×volume作日成交額近似，比較同長度窗口中位數，另列拆股校正股數量。",
    "caveat": "close×volume不是實際成交額；不能以拆股後股數自然增加當活躍提升。 未來事件可修訂；按事件及文件去重；內部人資料限有 SEC Form 4 覆蓋的美股。",
    "data_class": "衍生",
    "complexity": "高",
    "audience": "專業",
    "reach": 5,
    "frequency": 5,
    "decision": 6,
    "clarity": 8,
    "sample_labels": [
        "事件前",
        "事件後",
        "股數校正",
        "成交額變化"
    ],
    "cadence": "日更；公告修訂時刷新",
    "category_name": "公司事件與內部人",
    "score": 55.5,
    "requires_user_input": false,
    "requires_extra_plan": false,
    "source_urls": [
        "https://eodhd.com/financial-apis/api-splits-dividends",
        "https://eodhd.com/financial-apis/api-for-historical-data-and-volumes"
    ],
    "rank": 890,
    "stage": "P4",
    "svg_file": "mockups/0890-EVT-016.svg",
    "demo_fingerprint": "55e910a38d7da5ad",
    "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
        }
    }
}