Replace CUE with a logistic expression

[jacobcook1995]

Description

This PR replaces the current expression for CUE with a logistic expression. This is mainly so that the CUE can be parameterised to always be between 0 and 1.

@hrlai I've changed the function and constants so that it fits with the new model you suggested here. Once the data science side is sorted/merged you could add the values for the constants here.

Let me know how that goes! (also don't worry about the broken tests, they are mostly downstream stuff, I can fix them once you've made your changes)

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works
• Relevant documentation reviewed and updated

[hrlai]

@jacobcook1995 would you be able to add this citation to Zotero and then the bibliography file so I can cite the new data? Thanks.

[hrlai]

Looks good to me, should be ready to merge once I update the constants and add a reference.

[hrlai]

cool, I think I've added everything from this side and it is ready for you to take a final look.

[jacobcook1995]

@hrlai looks good! I'll fix the testing and merge it next week

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.79%. Comparing base (af805f4) to head (35bb8c7).
Report is 128 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #767   +/-   ##
========================================
  Coverage    94.79%   94.79%           
========================================
  Files           75       75           
  Lines         5591     5592    +1     
========================================
+ Hits          5300     5301    +1     
  Misses         291      291           

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