CusumResult
Results of a two-sided tabular CUSUM control chart analysis.
Holds the per-observation upper (C⁺) and lower (C⁻) cumulative sums produced by the tabular CUSUM algorithm, together with the index of the first observation at which an out-of-control signal fired. The upper sum C⁺ accumulates positive deviations above the target; the lower sum C⁻ accumulates negative deviations below the target. An alarm is signaled as soon as either sum exceeds the decision interval H.
See also
Properties
the zero-based index of the first observation at which C⁺ > H or C⁻ > H, or -1 if no alarm was triggered anywhere in the series.
the sequence of lower cumulative sums C⁻ᵢ, one entry per observation. Each value is non-negative; a rising C⁻ indicates a sustained negative shift from target.
the sequence of upper cumulative sums C⁺ᵢ, one entry per observation. Each value is non-negative; a rising C⁺ indicates a sustained positive shift from target.