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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

1 School Chemistry — Grades 1 to 121–12 年级在线 2 University Chemistry — Year 1本科一年级在线 3 University Chemistry — Year 2本科二年级在线 4 University Chemistry — Year 3本科三年级在线

1 Primary & Middle School Biology1–9 年级在线 2 High School Biology10–12 年级在线 3 University Biology — Year 1本科一年级在线 4 University Biology — Year 2本科二年级在线 5 University Biology — Year 3本科三年级在线

1 Primary & Middle School Earth and Space Sciences1–9 年级在线 2 High School Earth and Space Sciences10–12 年级在线 3 University Earth and Space Sciences — Year 1本科一年级在线 4 University Earth and Space Sciences — Year 2本科二年级在线 5 University Earth and Space Sciences — Year 3本科三年级在线

1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Return period？

Definition 8.7 High School Earth and Space Sciences · 第 8 章 — Drainage Basins, Rivers and Floods

The return period $T$ of a flood is the average interval, in years, between years whose annual peak equals or exceeds it. A flood of return period $T$ , a $T$ -year flood, has a probability $1/T$ of being equalled or exceeded in any one year.

The 95 annual peaks of the Potomac River near Washington, ranked and plotted against their return periods T = (n+1)/m. The largest, in March 1936, gets T = 96 years. Data: U.S. Geological Survey, station 01646500. — The $95$ annual peaks of the Potomac River near Washington, ranked and plotted against their return periods $T = (n+1)/m$ . The largest, in March 1936, gets $T = 96$ years. Data: U.S. Geological Survey, station 01646500.

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Definition 28.2 University Earth and Space Sciences — Year 2 · 第 28 章 — Geological Hazards and Risk

Let events of a given kind — a flood above a discharge, a ground motion above a level, an earthquake above a magnitude — occur at a mean annual rate $\lambda$ . Their return period is $T = 1/\lambda$ : the mean interval between two of them, and the inverse of their annual rate, not a timetable.

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