# Understanding the Backtesting Outcomes

Of course, past results are not always indicative of the future. You can learn from testing scenarios in different environments over time. We therefore recommend that you backtest for as long as possible. We recommend using strategies that have been backtested for at least 10 years.

### Delving into the Results

When it comes to understanding the effectiveness of a tactical or static asset allocation strategy, performance analysis plays a pivotal role. By backtesting a strategy, investors can gain valuable insights into its historical performance, allowing them to gauge its efficacy and potential for success in real-world scenarios.

### Analyzing the Data

The data gleaned from backtesting provides investors with a wealth of statistics that shed light on various aspects of the strategy's performance. From overall returns to risk metrics and drawdown analysis, these insights enable investors to identify strengths and weaknesses, fine-tune their approach, and optimize their strategies for better results.

### Learning from the Past

While past performance is indeed valuable, it's essential to recognize that it doesn't guarantee future success. However, by conducting thorough backtesting across different market conditions and timeframes, investors can glean valuable lessons and insights that can inform their decision-making processes moving forward.

### Need for Long-Term Backtesting

To ensure robustness and reliability, it's advisable to backtest strategies over extended periods, ideally spanning at least a decade. This extended timeframe allows investors to assess how their strategies perform across various market cycles and economic conditions, providing a more comprehensive understanding of their strategy's potential.

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td><strong>Guru's portfolio</strong></td><td>Find out more about Gurus' portfolios.</td><td></td><td><a href="/files/HJE9bxjKGzcQ4aFNycyV">/files/HJE9bxjKGzcQ4aFNycyV</a></td></tr><tr><td><strong>Build your portfolio!</strong></td><td>Easily create a portfolio by choosing ETFs</td><td></td><td><a href="/files/0GFAPKIWAeasWGnXwSmC">/files/0GFAPKIWAeasWGnXwSmC</a></td></tr><tr><td><strong>Sign up to ETF Portfolio!</strong></td><td>Click here to get started for free.</td><td></td><td><a href="/files/AmXUsT0mjpM7lXAN3vHZ">/files/AmXUsT0mjpM7lXAN3vHZ</a></td></tr></tbody></table>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.etf-portfolio.com/how-to-backtest-stratigies/portfolio-analysis.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.