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Category/ward changes and administrative practice can affect counts; these are not business openings, closures or employment.","Business frequency screening compares adjacent 24-month windows, requiring 48 complete months. The 12-month comparison is context only. Fixed two-year windows reduce renewal-calendar mismatch; they are not seasonal adjustment, proof of a renewal mechanism, or a test of stability.","Window assessment: opposite-directions. Annual-only flags do not enter the frequency ranking. Opposite directions and short history must not be described as persistent changes.","Many dependent filter conditions were searched. No multiple-testing-adjusted significance or causal attribution is claimed.","Frequency compares fixed equal-length windows of raw counts, not population risk or a celeration-factor ratio. 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