In Control Chart Builder, you can create Short Run charts, which are useful for scenarios where more than one product is made on an assembly line. Traditional control charts applied across products can be misleading when products have different target measurements. Short Run charts adjust for this by either centering or standardizing the observations. In centered charts, observations are centered using each specific product’s target. In standardized charts, observations are standardized using each specific product’s target and sigma combination.
Note: Centered charts assume constant variance across products.
There are several types of Short Run control charts that depend on the data and the specified statistics. The product target, product sigma, and control limits are calculated using the methods described in Wise and Fair (2006). See Statistical Details for Short Run Control Charts.
• Short Run Difference charts are a type of location chart that display the individual centered measurements.
• Short Run Z charts are a type of location chart that display the individual standardized measurements.
• Short Run Moving Range on Centered charts are a type of dispersion chart that display moving ranges of two successive centered measurements.
• Short Run Moving Range on Standardized charts are a type of dispersion chart that display moving ranges of two successive standardized measurements.
• Short Run Average Difference charts are a type of location chart that display subgroup averages of centered measurements.
• Short Run Z charts are a type of location chart that display subgroup averages of standardized measurements.
• Short Run Range on Centered charts are a type of dispersion chart that display subgroup ranges of centered measurements.
• Short Run Range on Standardized charts are a type of dispersion chart that display subgroup ranges of standardized measurements.
Note: Centered Short Run control charts are sometimes referred to as Delta charts or Deviation from Nominal (DNOM) charts. Standardized Short Run control charts are sometimes referred to as Z-MR charts.