Property Name

Parameter Name

Data Type

Default Value

Use

Subgroup Size

SubgroupSize

Integer

1

The number of raw data points to be included in each chart point.

Sample Size

SampleSize

Integer

100

For attribute SPC chart types, this is the size of the sample from which you are counting defects.

Lambda

Lambda

Floating point

1

For exponentially weighted moving average (EWMA) SPC chart types, this is a value between zero and one to weight the data when you compute a moving average.

The EWMA chart detects small process shifts. This value is related to the size of the shift you want to detect. Smaller values detect smaller process shifts. Values between .05 and .25 work well; try .08, .1, and .15.

Lower Limit of Box

BoxLowerLimit

Floating point

25

For Box-Whisker SPC chart types, enter the lower point for the box which is typically the first quartile.

Upper Limit of Box

BoxUpperLimit

Floating point

75

For Box-Whisker SPC chart types, enter the upper point for the box which is typically the third quartile.

Whisker Lower Limit

WhiskerLowerLimit

Floating point

0

For Box-Whisker SPC chart types, enter the lower whisker point which is typically zero percent.

Whisker Upper Limit

WhiskerUpperLimit

Floating point

100

For Box-Whisker SPC chart types, enter the upper whisker point which is typically 100 percent.

Histogram Cell Count

HistogramCellCount

Integer

10

For Histogram SPC chart types, enter the number of bars, or buckets, in the histogram.

Tolerance Type

ToleranceType

Integer

0

Enter zero for bilateral tolerance, one for high or upper level unilateral tolerance which is the target value for the upper specification limit, or negative one for low unilateral tolerance which is the target value to the lower specification.