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Field notes for skeptical builders.

Practical formulas, implementation audits and source-backed explanations for readers who want to reconstruct an idea rather than trust a chart.

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Risk management · 9 min read

Volatility Targeting Formula: Position Sizing Without Guesswork

Volatility targeting converts a risk budget and a recent volatility estimate into a repeatable exposure rule. The formula is simple; the timing, leverage cap and trading policy are where most implementation errors occur.

Published July 16, 2026 · Reviewed against primary research

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Daily Blogger journal · Trading costs

Trading Cost Drag: Bid-Ask Spread, Slippage, and Turnover Explained

A worked example for translating quoted spreads, expected slippage and annual turnover into a conservative backtest cost assumption.

Published July 18, 2026 on Blogger

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Publishing standard: each field note must include a reproducible rule, explicit assumptions, failure conditions, primary sources and links to the relevant Atlas tools or dossiers.