All values are invented teaching data, not actual people or accounts. One period is one row. The rate uses classified outcomes only; unknown outcomes are not converted to failures.
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| Period | Successes | Classified outcomes | Eligible unknown | Rate among classified |
|---|---|---|---|---|
| A | 9 | 12 | 3 | 75% |
| B | 4 | 8 | 0 | 50% |
A: 9/12 = 75% among classified outcomes, plus 3 unknown for 15 eligible units. Not a measured 75% among all 15. B: 4/8 = 50%, explicitly 0 unknown. Zero and unknown remain distinct.
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