The fatld package contains functionality to generate and characterize designs with four-and-two-level (FATL) factors. Design characteristics include word length pattern, defining relation, and number of clear interactions. For more information about the package see the documentation at https://abohyndoe.github.io/fatld/. A large collection of FATL designs can be explored interactively using a web app at https://abohyndoe.shinyapps.io/fatldesign-selection-tool/.

The package can be used from Python:

>>> import fatld
>>> D = fatld.Design(runsize=32, m=1, cols=[21, 27, 29])
>>> D.wlp()
[1, 3, 3, 0, 0]
>>> D.defining_relation()
['A1cef', 'A3deg', 'A1cdeh']
>>> print("There are %s 2-2 interactions clear from any main effect or other two-factor interaction." % D.clear('2-2'))
There are 6 2-2 interactions clear from any main effect or other two-factor interaction.
>>> print("The design contains %s four-level factors and %s two-level factors" % (D.m, D.n))
The design contains 1 four-level factors and 6 two-level factors

For more examples see the documentation.

The Python interface to the package is available on pypi. Installation can be done using the following command:

pip install fatld

All development is done in a virtual environment based on poetry, activate it using:

poetry shell

• Try to follow the PEP 8 style guide. A usefull tool for automated formatting is black. We do allow lines upto 120 characters.

• Document functions using the Numpy docstring convention

• Linting is based on ruff, configuration is found in the pyproject.toml file.

• Tests are ran using pytest and a coverage report can be generated using coverage inside the virtual environment:

  coverage run -m pytest tests
  coverage report -m

If you would like to contribute, please submit a pull request. (See the Github Hello World example, if you are new to Github).

By contributing to the repository you state you own the copyright to those contributions and agree to include your contributions as part of this project under the BSD license.

To submit a bug report or feature request use the Github issue tracker. Search for existing and closed issues first. If your problem or idea is not yet addressed, please open a new issue.

For further information please contact alexandre dot bohyn at kuleuven dot be