Alpha Reality Check

Evidence-first diagnostics for strategy decay, concentration risk, and backtest-to-live gaps.

Not another backtester. Alpha Reality Check audits trade-level results you already have. It does not fetch market data, generate strategies, optimize parameters, connect to an exchange, or execute trades.

The project is an early v0.1 MVP. Its deterministic reference policy is a review aid—not a statistical truth and not evidence that a strategy will make money.

30-second quick start

pip install alpha-reality-check
alpha-rc demo

Input

UTF-8 CSV with two required columns:

exit_time,pnl,symbol,stage,regime
2025-01-01T12:00:00Z,1.25,ASSET_A,backtest,calm
2025-01-02T12:00:00Z,-0.40,ASSET_B,backtest,volatile

pnl is the net PnL of one closed trade. Optional columns are symbol, stage, fees, slippage, regime, side, and strategy_id. Column names can be mapped in YAML; see input-schema.md.

Invalid timestamps, non-finite PnL, duplicate rows, and invalid configuration fail explicitly. Missing optional dimensions produce warnings and only disable the related analysis.

Commands

alpha-rc audit trades.csv
alpha-rc audit trades.csv --config policy.yaml --json result.json --markdown report.md
alpha-rc compare --backtest backtest.csv --paper paper.csv --live live.csv
alpha-rc demo
alpha-rc validate-config policies/reference.yaml
alpha-rc schema
alpha-rc --version

Example terminal summary:

Decision: CONTINUE | Decision scope: overall | Trades: 80 | Expectancy: 0.669388

Machine-readable JSON separates decision-scope metrics from overall_metrics, stage_metrics, and regime_metrics. It also includes stage comparisons, every evaluated gate, explicit warnings, and input metadata without absolute local paths.

Decisions

Decision priority is REJECT > PAUSE > WATCH > CONTINUE. Defaults are documented in reference-policy.md and can be overridden with YAML. --fail-on supports never, watch, pause, and reject; the default is never.

Backtest / paper / live comparison

When stage is available, the audit computes metrics by stage and reports target-minus-source gaps for expectancy, profit factor, win rate, and absolute drawdown. The preferred comparisons are backtest → paper, paper → live, and backtest → live. Missing stages remain not_available.

The top-level decision always uses the highest evidence stage present in the fixed order live > paper > backtest. Its decision_scope, metrics, reason codes, and gates are based only on that stage; lower stages never supplement its sample count. Without a valid stage, the scope is overall. The audit and compare commands share this behavior.

alpha-rc compare \
  --backtest results/backtest.csv \
  --paper results/paper.csv \
  --live results/live.csv

What it measures

• expectancy, profit factor, win rate, cumulative PnL, and drawdown;
• deterministic bootstrap probability that mean trade PnL is positive;
• recent-versus-history expectancy decay;
• top-five winner and largest-symbol profit concentration;
• stage and regime breakdowns.

See methodology.md for definitions.

Limitations

The tool does not prove causality, statistical significance, execution quality, or future profitability. An iid trade bootstrap may be inappropriate for serially dependent strategies. PnL units and data completeness are the user's responsibility. Read limitations.md before using a decision in a review process.

Nothing in this repository is investment advice.

CI use

A minimal reusable shell step is documented in ci-usage.md. The repository's own test matrix covers Python 3.11, 3.12, and 3.13 on Ubuntu.

Contributing

Issues and focused pull requests are welcome. Start with CONTRIBUTING.md and follow the code of conduct.

Roadmap

The next candidates are documented in ROADMAP.md. They are plans, not promises. v0.1 intentionally excludes Web UI, databases, cloud services, market-data downloads, optimization, and trading.

中文简介

Alpha Reality Check 是一个“证据优先”的策略结果审计 CLI：读取你已有的交易 CSV，检查收益衰减、赢家集中度以及回测到模拟/实盘之间的落差。它不是回测器， 不连接交易所、不下单，也不承诺盈利。默认决策规则只是透明、可修改的参考政策。

License

Apache-2.0.