What does the Zephyrine skill do?

Turn a beautiful 2.1 Sharpe ratio into a bootstrap significance test, and find out if it's real edge or a coin flip wearing a chart. Load it once into Claude Projects and you get a configured Quant Backtesting Researcher without re-explaining context at the start of every session. This is educational and informational content, not financial advice. Markets involve risk of loss; verify every strategy, calculation, and configuration against your own broker, exchange, and risk tolerance before trading real capital.

How do I install this skill file?

Download the .skill package (it contains SKILL.md), paste the contents into Claude Projects Instructions or your AI's system prompt, add your own context and start your first session. Works with Claude, ChatGPT, or any AI chat that accepts system prompts.

Which AI tools does this skill work with?

Works with Claude (recommended), ChatGPT, Gemini, Perplexity and Copilot, and any AI chat that accepts system prompts. Claude Projects gives the best results.

What is included in this download?

One .skill package delivered instantly after purchase: the full SKILL.md role configuration plus a worked-example file with a real scenario so you see the quality before you rely on it. No subscription, yours permanently.

How is this different from using Claude without the Zephyrine skill?

Without a skill file your AI starts every session as a general assistant. With Zephyrine loaded it applies Quant Backtesting Researcher methodology from the first message, with consistent quality every time. This is educational and informational content, not financial advice. Markets involve risk of loss; verify every strategy, calculation, and configuration against your own broker, exchange, and risk tolerance before trading real capital.

Quant Backtesting Researcher AI Skill for Claude & ChatGPT

Name: Zephyrine — Quant Backtesting Researcher AI Skill
Brand: KissMySkills
Availability: InStock

Zephyrine — Quant Backtesting Researcher AI Skill

$34.00

Zephyrine — Quant Backtesting Researcher AI Skill

$34.00

⚡ Instant download ◆ Claude & ChatGPT ∞ Keep forever

Instant download · 30-day money-back guarantee. Pay once, keep forever — no subscription. Refund policy

Turn a beautiful 2.1 Sharpe ratio into a bootstrap significance test, and find out if it's real edge or a coin flip wearing a chart.

Hypotheses written down and frozen before any historical data gets pulled
Python backtests (Backtrader, QuantConnect, vectorbt-style) built with realistic costs and slippage from the first run
Walk-forward and cross-validation splitting to catch curve-fit results before they get trusted
Statistical significance testing (bootstrap, t-test, permutation) so a good Sharpe ratio isn't mistaken for edge

Traders and researchers who want a systematic strategy idea rigorously validated in Python before risking capital on it.A senior Quant Backtesting Researcher bills $110+/hr, this is one file, yours forever.

// what's inside

Drop Zephyrine into Claude and get a Senior Quant Backtesting Researcher who treats every strategy idea as a hypothesis to be disproven, not a discovery to be celebrated.

Zephyrine covers hypothesis formation, Python backtesting with realistic costs, walk-forward and cross-validation, statistical significance testing, and multi-strategy portfolio correlation analysis.

What you get

→Hypotheses written down and frozen before any historical data gets pulled
→Python backtests (Backtrader, QuantConnect, vectorbt-style) built with realistic costs and slippage from the first run
→Walk-forward and cross-validation splitting to catch curve-fit results before they get trusted
→Statistical significance testing (bootstrap, t-test, permutation) so a good Sharpe ratio isn't mistaken for edge

📄 zephyrine-quant-backtesting-researcher.skill Under 2 min install Works with Claude, ChatGPT & any AI chat

How to install

Download the .skill package → open Claude → paste SKILL.md into your Project Instructions or system prompt → describe your requirement → Zephyrine builds the answer. Includes a full worked example so you see exactly what you get.

zephyrine-quant-backtesting-researcher.skill

# Zephyrine - Quant Backtesting Researcher

You are Zephyrine, a Senior Quant Backtesting Researcher. Treat every strategy idea as a hypothesis to be disproven.

## How you work
1. Form the hypothesis before looking at returns
2. Build the backtest with realistic frictions from the start
3. Split the data before optimizing anything
4. Test whether the result could be noise, with a real significance test
5. Check the strategy in a portfolio context, then deliver a verdict, not just a chart

A lucky draw is not edge until a significance test says otherwise.

Excerpt from the actual file you'll download.

// try it

prompt

$My strategy backtests at a 2.1 Sharpe ratio. Does it actually have edge, or did I get lucky?

Zephyrine checks the in-sample/out-of-sample split first, confirms transaction costs and slippage were modeled honestly, then bootstraps the Sharpe ratio against 1,000 resampled return paths and reports whether it clears statistical significance or looks indistinguishable from noise.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the file anywhere on your device.
02
Open your AI chat
Claude, ChatGPT, Gemini, Grok, or Copilot — whichever one you already use.
03
Paste the file contents
Drop it into the system prompt, Project instructions, or custom instructions field.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.