Alphalens is a Python library for performance analysis of predictive (alpha) stock factors. Alphalens works great with the Zipline open source backtesting library, and Pyfolio which provides performance and risk analysis of financial portfolios.

The main function of Alphalens is to surface the most relevant statistics and plots about an alpha factor, including:

• Returns Analysis
• Information Coefficient Analysis
• Turnover Analysis
• Grouped Analysis

With a signal and pricing data creating a factor "tear sheet" is a two step process:

import alphalens

# Ingest and format data
factor_data = alphalens.utils.get_clean_factor_and_forward_returns(my_factor,
                                                                   pricing,
                                                                   quantiles=5,
                                                                   groupby=ticker_sector,
                                                                   groupby_labels=sector_names)

# Run analysis
alphalens.tears.create_full_tear_sheet(factor_data)

Check out the example notebooks for more on how to read and use the factor tear sheet.

Install with pip:

pip install alphalens-reloaded

Install with conda:

conda install -c ml4t alphalens-reloaded

Install from the master branch of Alphalens repository (development code):

pip install git https://github.com/stefan-jansen/alphalens-reloaded

Alphalens depends on:

• matplotlib
• numpy
• pandas
• scipy
• seaborn
• statsmodels

Note that Numpy>=2.0 requires pandas>=2.2.2. If you are using an older version of pandas, you may need to upgrade accordingly, otherwise you may encounter compatibility issues.

A good way to get started is to run the examples in a Jupyter notebook.

To get set up with an example, you can:

Run a Jupyter notebook server via:

jupyter notebook

From the notebook list page(usually found at http://localhost:8888/), navigate over to the examples directory, and open any file with a .ipynb extension.

Execute the code in a notebook cell by clicking on it and hitting Shift Enter.

If you find a bug, feel free to open an issue on our github tracker.

If you want to contribute, a great place to start would be the help-wanted issues.

• Andrew Campbell
• James Christopher
• Thomas Wiecki
• Jonathan Larkin
• Jessica Stauth ([email protected])
• Taso Petridis

For a full list of contributors see the contributors page.

Example factor courtesy of ExtractAlpha