Understand Statistical Quality Control (SQC) analyses

You can create analyses that use standard Statistical Quality Control (SQC) tests to determine if the value of a PI AF attribute lies within user-specified margins of error. Further, you can specify either attributes or event frames as outputs of your SQC analysis.

The following SQC pattern tests may be selected:

• Outside Control:

  Counts the number of samples outside the control limit on one side of the center line.

• Outside 2 Sigma:

  Evaluates the sample against a limit drawn 2/3 of the way between the center line and the control limit.

• Outside 1 Sigma:

  Evaluates the sample against a limit drawn 1/3 of the way between the center line and the control limit.

• One Side of Center Line:

  Counts the number of samples on one side of the center line.

• Stratification:

  Counts the number of samples that fall within the upper and lower One Sigma limits on both sides of the center line.

• Mixture:

  Counts the number of samples that fall outside the upper and the lower One Sigma limits on both sides of the center line.

• Trend:

  Counts the number of samples which are increasing or decreasing in a monotonic sequence.