BUG: Fix bugs in fixed result

[bashtage]

Systematically find an fix bugs that affect fixed results

closes #749

[pep8speaks]

Hello @bashtage! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2024-10-30 16:05:30 UTC

[codecov]

Codecov Report

Attention: Patch coverage is 64.04494% with 32 lines in your changes missing coverage. Please review.

Project coverage is 93.35%. Comparing base (47e796f) to head (779bf28).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
arch/tests/univariate/test_mean.py	59.45%	30 Missing ⚠️
arch/univariate/volatility.py	75.00%	1 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (47e796f) and HEAD (779bf28). Click for more details.

HEAD has 8 uploads less than BASE

Flag	BASE (47e796f)	HEAD (779bf28)
	12	4

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #750      +/-   ##
==========================================
- Coverage   99.52%   93.35%   -6.18%     
==========================================
  Files          74       74              
  Lines       15463    15536      +73     
  Branches     1270     1273       +3     
==========================================
- Hits        15389    14503     -886     
- Misses         50     1003     +953     
- Partials       24       30       +6     

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