Quality and Process Methods • Control Chart Builder • Excluded and Hidden Samples

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Excluded and Hidden Samples
The following bullets summarize the effects of various conditions on samples and subgroups:
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Excluded subgroups are not used in the calculations, but appear in the chart (although dimmed).
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Hidden observations are used in the calculations, but do not appear in the chart.
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Both hidden and excluded rows are included in the count of points for Tests for Special Causes. An excluded row can be labeled with a special cause flag. A hidden point cannot be labeled. If the flag for a Tests for Special Causes is on a hidden point, it will not appear in the chart.
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For partially excluded subgroups, if one or more observations within a subgroup is excluded, and at least one observation within the subgroup is included, the excluded observation is not included in the calculations of either the point statistic or the limits.
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Checks for negative and non-integer data happen on the entire data (even excluded values).
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Tests continue to apply to all excluded subgroups. Excluded samples are flagged when tests are turned on.

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Help created on 3/19/2020