Longbridge Quant

---
description: Curated upstream guidance for Longbridge Quant; use when the workflow matches the user goal.
name: longbridge-quant
license: MIT
metadata:
  author: longbridge
  version: 1.0.0
  risk_level: read_only
  requires_login: false
  default_install: true
  requires_mcp: false
  tier: read
source_repo: longbridge/skills
source_type: official
source: longbridge
date_added: '2026-09-21'
risk: critical
---
## When to Use
- Use when this upstream workflow matches the user's stated goal.
- Use when the task requires the procedures documented in this skill.

# Longbridge Quant

Quantitative analysis frameworks and CLI indicator scripting via Longbridge.

> **Response language**: match the user's input language — English / Simplified Chinese / Traditional Chinese.
> **RULE: Response language priority**: English is the default when language is ambiguous. If the user input is only a slash command, command name, ticker / symbol, or contains no natural-language language signal, you MUST respond in English. Do not infer Chinese from trigger keywords, skill metadata, or examples.

> **Data-source scope**: this skill documents Longbridge. If its data is unavailable or insufficient, report the gap rather than inventing data or asserting that other sources are disallowed.

> **Connector availability**: discover the tools actually available in the host; do not assume a Longbridge plugin or parity with CLI capabilities.

## When to Use
Trigger when user asks about: quantitative indicator scripts (running against K-line data), pairs trading / cointegration, volatility regime strategies, seasonality / calendar effects, multi-factor stock selection, factor research (IC/IR analysis), factor screening, correlation and cointegration analysis, statistical methods (ADF/GARCH/bootstrap), strategy optimization, execution cost modeling, hedging strategies, or ML-based prediction.

## Sub-topic Routing

| User intent | Load references file |
|---|---|
| Run indicator scripts on kline | references/quant-cli.md |
| Pairs trading / cointegration | references/pairs-trading.md |
| Volatility regime strategy | references/volatility-strategy.md |
| Seasonality / calendar effects | references/seasonality.md |
| Multi-factor model | references/multifactor.md |
| Factor research (IC/IR analysis) | references/factor-research.md |
| Factor screening | references/factor-screen.md |
| Correlation / cointegration | references/correlation.md |
| Statistical methods (ADF/GARCH) | references/quant-stats.md |
| Strategy optimization | references/strategy-optimizer.md |
| Execution cost modeling | references/execution-model.md |
| Hedging strategy design | references/hedging.md |
| ML-based prediction | references/ml-strategy.md |

## CLI: quant

The `quant` command runs user-defined indicator scripts against K-line data.

```bash
longbridge quant --help
```

Use `longbridge kline <SYMBOL> --format json` (from longbridge-market-data) to obtain OHLCV input data.

## Quantitative Frameworks

### Pairs Trading / Statistical Arbitrage
Engle-Granger cointegration, hedge ratio via OLS, Z-score, half-life of mean reversion, entry/exit signals. See [references/pairs-trading.md].

### Volatility Strategy
20-day / 60-day HV, percentile rank, long-vol (buy straddle) vs short-vol (iron condor) regime signals. See [references/volatility-strategy.md].

### Seasonality / Calendar Effects
Month-of-year returns (January Effect), day-of-week effects, pre/post-holiday drift, earnings season effect. See [references/seasonality.md].

### Multi-Factor Model
Value (1/PE, 1/PB), momentum (60-day), quality (ROE), low-vol (60-day HV) — Z-score composite, TopN portfolio. See [references/multifactor.md].

### Factor Research
IC, IR, factor decay, layer backtest, IC-weighted combination. See [references/factor-research.md].

### Factor Screening
Batch screening with PE, PB, ROE, revenue growth, dividend yield filters. See [references/factor-screen.md].

### Correlation & Cointegration
Pairwise return correlation, rolling correlation, Johansen test. See [references/correlation.md].

### Quantitative Statistics
ADF unit-root test, GARCH volatility modeling, regression diagnostics, bootstrap. See [references/quant-stats.md].

### Strategy Optimizer
Parameter sweep, walk-forward optimization, out-of-sample validation. See [references/strategy-optimizer.md].

### Execution Model (Backtest)
Slippage formulas (linear / square-root), VWAP/TWAP logic, market impact estimation. See [references/execution-model.md].

### Hedging Strategy
Beta hedging, options protection, tail-risk hedging, cross-asset hedging. See [references/hedging.md].

### ML Strategy (sklearn)
Rolling walk-forward Random Forest / Gradient Boosting, feature engineering, signal generation. See [references/ml-strategy.md].

## Auth requirements

`quant` execution is analytical but sends the supplied script to a remote service. Market-data access can require login/entitlements; positions require explicit account-access scope. Verify installed CLI capabilities and current permissions. Do not submit proprietary strategy code without authorization.

## Error handling

| Situation | Response |
|---|---|
| `command not found: longbridge` | Install longbridge-terminal |
| `ModuleNotFoundError: sklearn` | Run `pip install scikit-learn` |
| Insufficient data for ADF test | Need at least 50 observations; increase kline history |

## MCP fallback

Use MCP server for kline data if CLI unavailable. Discover tools at runtime.

## Related skills

| User wants | Use |
|---|---|
| Raw K-line data | `longbridge-market-data` |
| Technical analysis | `longbridge-technical` |
| Options volatility | `longbridge-derivatives` |

## File layout

```
longbridge-quant/
├── SKILL.md
└── references/
    ├── quant-cli.md
    ├── pairs-trading.md · volatility-strategy.md · seasonality.md
    ├── multifactor.md · factor-research.md · factor-screen.md · correlation.md
    ├── quant-stats.md · strategy-optimizer.md · execution-model.md
    └── hedging.md · ml-strategy.md
```


## Examples

```text
User: Apply this skill to my current task.
Assistant: Follow the workflow in this skill, cite limitations, and ask before risky steps.
```

## Limitations

- This skill performs analysis, not order execution. Strategy descriptions are hypotheses requiring realistic costs, liquidity, borrow/margin and out-of-sample validation. Do not invent recommendations from missing data.
- For historical research, require point-in-time constituents and fundamentals with publication timestamps; current values cannot support a historical factor backtest. Adjust prices for corporate actions and align currency, timestamps and trading calendars.
- Cite Longbridge only when data was actually retrieved there; report its timestamp, coverage and adjustments. Redact credentials/private account data from errors and reports.

- Imported upstream skill; verify credentials, permissions, and safety boundaries before execution.
- Does not replace environment-specific validation, testing, or maintainer review.