update CBPE base estimate functions

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.05%. Comparing base (87f0d48) to head (1368567).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #416 +/- ## ========================================== + Coverage 77.02% 77.05% +0.02% ========================================== Files 109 109 Lines 9663 9675 +12 Branches 1746 1746 ========================================== + Hits 7443 7455 +12 Misses 1722 1722 Partials 498 498 ```

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