{
    "id": "OPT-018",
    "category": "OPT",
    "title": "時間值流失強度",
    "question": "哪些合約對每日時間流失最敏感？",
    "chart": "bar",
    "metric": "每日 Theta／中價（%／日）",
    "secondary": "絕對Theta及DTE",
    "x": "合約",
    "y": "每日 Theta／中價（%／日）",
    "panels": [
        "主圖：每日 Theta／中價（%／日），依合約排列",
        "輔圖：絕對Theta及DTE",
        "明細：時間值流失強度的資料列、觀測日期與缺值狀態"
    ],
    "filters": [
        "美股標的與報價日",
        "到期日與行權價",
        "最少DTE與有效中價"
    ],
    "apis": [
        "OPTIONS"
    ],
    "calculation": "校驗 theta 單位後以 abs(theta)/midpoint 計相對流失，保留Theta方向。",
    "caveat": "Theta只是局部敏感度，實際損益同時受股價和IV影響。 Marketplace 額外方案；僅美股日終快照，不含逐筆買賣方向或券商庫存；先驗證合約乘數。",
    "data_class": "額外方案",
    "complexity": "中",
    "audience": "進階",
    "reach": 6,
    "frequency": 6,
    "decision": 7,
    "clarity": 8,
    "sample_labels": [
        "低流失",
        "中等流失",
        "高流失",
        "極近到期"
    ],
    "cadence": "美股收市後日更",
    "category_name": "美股期權",
    "score": 64.5,
    "requires_user_input": false,
    "requires_extra_plan": true,
    "source_urls": [
        "https://eodhd.com/marketplace/unicornbay/options"
    ],
    "rank": 752,
    "stage": "P3",
    "svg_file": "mockups/0752-OPT-018.svg",
    "demo_fingerprint": "e154dadba93f9c15",
    "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
        }
    }
}