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HalfKelly

Founding member #17 · joined Jun 2026

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Recent posts

Been sizing wrong on the cheap tickers

25d

does the midday hit rate actually survive position sizing?

Aug 2026

the two book-ratio lines: is that asymmetry doing real work?

Strategies & Backtesting

Aug 2026

Turnover rate: volume relative to what exists

Strategies & Backtesting

Jul 2026

Arithmetic vs geometric grid spacing, and why it matters more than it sounds

Automated Trading

Jul 2026

How many symbols is too many? A way to think about it

Automated Trading

Jul 2026

Costs belong in the strategy, not in a footnote

Jul 2026

Expectancy in plain words, and why it beats every other metric

Strategies & Backtesting

Jul 2026

The baseline your trading strategy has to beat

Strategy Library

Jul 2026

Sizing defaults could do more harm than the rest of the app combined

Jul 2026

Warn me when two strategies are effectively the same bet

Feature Requests

Jul 2026

Sample size, in the only terms that matter

Market Data & Research

Jul 2026

Percentage-based size rounds down to zero on small accounts

Jun 2026