Julia's coding blog - Practice makes perfect
From January 2015, she started to practice leetcode questions; she trains herself to stay focus, develops "muscle" memory when she practices those questions one by one. 2015年初, Julia开始参与做Leetcode, 开通自己第一个博客. 刷Leet code的题目, 她看了很多的代码, 每个人那学一点, 也开通Github, 发表自己的代码, 尝试写自己的一些体会. She learns from her favorite sports – tennis, 10,000 serves practice builds up good memory for a great serve. Just keep going. Hard work beats talent when talent fails to work hard.
Sunday, February 8, 2026
CTA策略(商品交易顾问,Commodity Trading Advisors)
CTA策略(商品交易顾问,Commodity Trading Advisors)指通过在期货、期权等衍生品市场做多或做空以追求绝对收益的投资管理人或基金。其核心特色包括利用系统化/主观策略进行多空双向交易、分散投资于大宗商品及金融衍生品、以及在市场牛熊中寻找盈利机会。
- 定义与特征:CTA(商品交易顾问)最初是指在美国NFA注册、为客户提供期货交易建议的专业人士,现已演化为管理期货(Managed Futures)基金的通称。其核心是以期货、期权等衍生品为投资标的,通过捕捉市场趋势来盈利。
- 策略分类:
- 趋势策略(Trend Following):根据大宗商品及金融衍生品的不同周期趋势进行做多或做空操作。
- 反转策略(Reversal):利用期货价格的短期反转性波动进行方向交易。
- 套利策略(Arbitrage):利用相关品种不同期限或品种间的价格差进行跨期或跨品种套利。
- 投资对象:不仅限于农产品、金属等大宗商品期货,还广泛涵盖股指期货、国债期货、外汇期货等各种金融衍生品。
- 交易方式:多采用系统化、程式化交易策略,依赖算法技术分析,强调数学模型和纪律性,试图减少人为主观情绪影响。
- 历史与规模:起源于20世纪70年代,21世纪以来管理规模实现快速爆发,成为分散投资组合、抗击市场暴跌的重要工具。
CTA策略(商品交易顾问,Commodity Trading Advisors)
CTA策略(商品交易顾问,Commodity Trading Advisors)是一种以趋势追踪为主的量化管理期货策略。其核心在于利用计算机模型分析大宗商品、金融期货的价格走势,在市场上涨或下跌中通过做多或做空获取“危机Alpha”收益。快速理解的关键是“追涨杀跌”、分散配置与高杠杆自动化。
- 核心本质:追涨杀跌 (Trend Following)
- 上涨趋势中做多,下跌趋势中做空。 不预测顶部或底部,而是跟随市场趋势。
- 危机Alpha: 当股票或债券市场大跌时,CTA通常能通过做空获得正收益,从而起到对冲风险的作用。
- 交易方式:量化与系统化 (Systematic/Quantitative)
- 基于数学模型: 使用算法分析图表、技术指标(均线、动量)来生成买卖信号,彻底排除人为情绪干扰。
- 交易品种广: 投资于大宗商品(农产品、能化、金属)以及金融期货(股指、国债)。
- 核心特征:低相关性与高波动
- 不看市道: 只要市场有剧烈波动,无论涨跌均有机会盈利。
- 配置价值: 因为它与传统资产(股票/债券)相关性低,非常适合作为投资组合的风险分散工具。
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Feb 9 week earnings calendar
7
The video provides a portfolio update, discussing the performance of the "Koshi Investing Portfolio 2K" and individual stock movements (0:00). The host details upcoming earnings reports from various companies and their expected growth rates (1:04).
Key takeaways include:
- Portfolio Performance: The portfolio was down 6.3% over the past week, bringing the year-to-date performance to -3.92% (0:03). Since its inception, the portfolio is up 142% compared to the S&P 500's 39% (0:27).
- Earnings Calendar: The video lists several companies reporting earnings next week, including Pagaya, monday.com, Open Door, Coca-Cola, Oscar Health, Robinhood, Shopify, Unity, McDonald's, Applovin, Cisco, Coinbase, Pinterest, and Rivian (1:04-3:08).
- Stock Deep Dives:
- Robinhood: The company is expected to grow revenue by 53.4% for the past fiscal year, with continued growth projected (3:19). The host notes the impact of Bitcoin's price on Robinhood's stock and discusses the company's "prediction markets" (3:40, 5:11).
- Pagaya: Expected to grow revenue by 27.4% for the past fiscal year, with a deceleration in growth projected for future years (5:41). The host believes Pagaya will exceed Wall Street expectations (6:26).
- Nebius: The stock saw a 16.6% increase recently (6:37). The host reviews the company's targeted annualized run rate (ARR) revenue and contracted power goals for 2025 and 2026 (7:00).
- Meta: Despite reporting "amazing earnings," Meta's stock is back to its pre-earnings level (11:06). The host highlights its strong revenue generation ($200 billion) and expected 24% growth, considering it a good value at 22 times forward earnings (11:27).
- Oscar Health: The host increased their position in Oscar Health, accumulating shares at a lower price (12:19). The company is expected to return to profitability in 2026 (12:31).
- Portfolio Adjustments: The host sold 300 shares of Iron to invest more in Nebius and SoFi (9:56). They also increased positions in Dlocal, Robinhood, and Meta, and sold all shares of PayPal due to perceived lack of transparency from the company (13:44, 14:19).
- Market Analysis: The video touches on the "fear and greed index," the NASDAQ 100 stocks being oversold, and the total put-to-call ratio, suggesting potential market bottoms (21:16). The host also discusses the low correlation among S&P 500 components, indicating a market where large tech companies are not participating as much as other stocks (23:19).
- Investment Philosophy: The host emphasizes that good companies get rewarded and bad companies get punished (25:00). The video concludes with a clip from Peter Lynch, explaining market corrections and the importance of taking advantage of declines if you understand the companies you own (28:12