[1106maxi]

Summary

Fixes KeyError: 0 when running with pandas 3.x.

Cause

Series[0] on a string-indexed Series (e.g. model.tvalues, indexed by variable name) used to fall back to positional access. That fallback was deprecated in pandas 2.1 and removed in 3.0, so partial_r2 and extract_from_model now raise KeyError: 0.

Changes

• Use .iloc[0] for positional access in sensitivity_statistics.py and sensitivity_plots.py.

Testing

Environment: macOS, Python 3.14.0, pandas 3.0.6
(run with pytest --continue-on-collection-errors for "before", since
tests/test_ovb_plots.py otherwise aborts collection)

• Before: 19 failed, 28 passed, 2 errors (mostly KeyError: 0; a few
  SystemExit: [...] must be numeric). Coverage 67%.
• After: 49 passed. Coverage 94%.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.36%. Comparing base (a45d7f0) to head (2a66d6f).
⚠️ Report is 1 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   94.97%   94.36%   -0.62%     
==========================================
  Files          12       12              
  Lines        1235     1243       +8     
==========================================
  Hits         1173     1173              
- Misses         62       70       +8     

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