【データ出所】・米国FF金利:Board of Governors of the Federal Reserve System (US), Federal Funds Effective Rate [FEDFUNDS] のデータをFRED(Federal Reserve Bank of St. Louis)経由で取得.・ドル円レート:Board of Governors of the Federal Reserve System (US), Japanese Yen to U.S. Dollar Spot Exchange Rate [EXJPUS] のデータをFRED(Federal Reserve Bank of St. Louis)経由で取得・日本の無担保コール金利:OECD (2026), "Main Economic Indicators", Interest Rates: Immediate Rates (< 24 Hours): Call Money/Interbank Rate: Total for Japan [IRSTCI01JPM156N], https://data-explorer.oecd.org/ (accessed on 2026-07-07) のデータをFRED(Federal Reserve Bank of St. Louis)経由で取得1/1