Blog
Methodology, comparisons, and walkthroughs. Plain-prose, no marketing.
- Backtesting
Why Backtests Lie: The Lookahead Bias Trap
Most quant blog backtests look amazing on paper and fail in production. The reason is almost always lookahead bias. Here's exactly what it is and how to prevent it.
2026-05-109 minen - Methodology
Multi-Agent LLM vs Single-Prompt ChatGPT for Stock Analysis
Why does asking ChatGPT 'should I buy AAPL?' produce a hand-wavy answer? Because one prompt can't do five specialist jobs. Here's what changes when you separate roles.
2026-05-097 minen - Comparison
Concordal vs Bloomberg Terminal: Honest Comparison
Bloomberg costs $25,000/year per seat. Concordal is free and open-source. Here's what each does, what each doesn't, and when each makes sense.
2026-05-088 minen - Walkthrough
AAPL Through 5 AI Analyst Lenses: A Walkthrough
We run AAPL through every stage of the Concordal pipeline and show what each analyst sees, what they disagree on, and how the manager resolves it.
2026-05-0710 minen - A股方法论
为什么 A 股决策需要东方财富股吧而不是 Twitter
做 A 股不能照搬美股的 Reddit/Twitter 套路。东方财富股吧才是中国散户真实情绪的水源地。这里把数据源、抓取限制、隐性偏差都讲清楚。
2026-05-068 minzh