Attributes step-by-step interpretation

Are there nonrandom patterns on the chart?

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Attributes step-by-step interpretation

The process is not in control. Investigate the cause(s) of the variation and determine if effects are good or bad. For more information, select:

Declare the system stable or unstable.

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Attributes step-by-step interpretation

Are there runs on the control chart?

Yes No

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Attributes step-by-step interpretation

The process is not in control. Investigate the cause(s) of the variation and determine if effects are good or bad. For more information, select:

Declare the system stable or unstable.

SPC DEMO

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Attributes step-by-step interpretation

To analyze nonconforming items, create a p- or np-chart. To analyze the number of nonconformities, create a c- or u-chart. For more information, select:

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Attributes step-by-step interpretation

Are there any points falling outside the control limits?

Yes No

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Attributes step-by-step interpretation

You do not have enough data to get good estimates of process spread and location. For a more accurate picture of your process, you should have at least 100 data values or 20-25 subgroups (samples).

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Attributes step-by-step interpretation

Is there a p-, np-, c- or u-chart?

Yes No

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Attributes step-by-step interpretation

Are there 100 data values (observations)?

Yes No

SPC DEMO

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