SPC Charts - X Chart Center/Sigma

Use this tab to define the following parameters:

Element Name Description
Centerline type This dropdown list allows you to select the Centerline type from these options:
  • Calculated process mean
  • Calculated median
  • Use defined centerline
  • If Use defined centerline is selected, the analysis will look for variables named *_CENTER for each characteristic (where '*' is the name of the characteristic) and use the value of the variable as the centerline value.
  • Each time the value in the *_CENTER variable changes, moving downward in the column, the system will create a new set.
  • If a value in the *_CENTER variable is blank, the system will use the previous valid value found in the column.
  • If no valid values are found in the *_CENTER variable, the Calculated process mean will be used as the Centerline value.
Sigma type Use this dropdown list to choose the one of the following Sigma types:
  • Calculated process sigma
  • Standard deviation
  • Use defined sigma
    • If Use defined sigma is selected, the analysis will look for variables named *_SIGMA for each characteristic (where '*' is the name of the characteristic) and use the value of the variable as the Sigma value.
    • Each time the value in the *_SIGMA variable changes, moving downward in the column, the system will create a new set.
    • If a value in the *_SIGMA variable is blank, the system will use the previous valid value found in the column.
    • If no valid values are found in the *_SIGMA variable, the Calculated process sigma will be used as the Sigma value.
Centerline label type This dropdown list allows you to choose from the Centerline label types:
  • Number only
  • Text only
  • Text and number
  • None
Target type The target line is a user defined reference line or limit line for each type of sample in data. You must define a Sample identifier variable on the General tab> Variable for the target line to work.
Variable to use as sample identifier selection box This dropdown list allows you to select one of the following Target line types:
  • None
  • Used defined target
Target label name In this text box, enter a label for the Target line when the  Text only or Text and number options are selected.
Target label Type This dropdown list allows you to choose the Target label type from the following:
  • Text only
  • Text and number
  • Number only
  • None
Target line type Use this dropdown list to specify the shape of the Target line in graphs from the following:
  • Solid
  • Dash
  • Dot
  • Dash Dot
  • Dash Dot Dot
  • Dot 2
  • Dense Dot
Target line size Use this miniscroll to select the Target line size. The range allowed is between 0.1 to 20. If any other values are specified, a default value of 0.2 will be used as Target line size.
Note: If the node has already been run, the most recent valid value used in this field will be applied to the analysis.
Target line color This dropdown list allows you to choose the Target line color from the following:
  • Orange
  • Yellow
  • Blue
  • Red
  • Black
  • Dark Grey
  • Light Grey
  • Green
  • Purple
  • Pink
  • Brown
  • Light Blue