Retrieving Limits from a Data Table

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The control limits or limit parameter values can be either in a JMP data table, referred to as the Limits Table, or stored as a column property in the process column. You can retrieve the Limits Table with the Get Limits option on the Control Chart Builder red triangle menu.

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Except for _Sample Size, any needed values not specified are estimated from the data.

Limits Table Keys with Appropriate Charts and Meanings
Keywords	For Charts	Meaning
_KSigma	All except Control Chart Builder	multiples of the standard deviation of the statistics to calculate the control limits; set to missing if the limits are in terms of the alpha level
_Alpha	All except Control Chart Builder	Type I error probability used to calculate the control limits
_Range Span	IM, MR, MMR	number of consecutive measurements for which moving ranges are computed. Not applicable in the Control Chart Builder platform, where the range span is always equal to 2.
_Std Dev	X-, R-, S-, IM, MR	known process standard deviation
_U	c-, u-	known average number of nonconformities per unit
_P	np-, p-	known value of average proportion nonconforming
_LCL, _UCL	X-, IM, p-, np-, c-, u-, g-, t-	lower and upper control limit for Mean Chart, Individual Measurement chart, or any attribute or rare event chart
_AvgR	R-, MR	average range or average moving range
_LCLR, _UCLR	R-, MR	lower control limit for R- or MR chart upper control limit for R- or MR chart
_AvgS, _LCLS, _UCLS	S-Chart	average standard deviation, upper and lower control limits for S-chart
_AvgR_PreMeans _AvgR_PreStdDev _LCLR_PreMeans _LCLR_PreStdDev _UCLR_PreMeans _UCLR_PreStdDev _Avg_PreMeans _Avg_PreStdDev _LCL_PreMeans _LCL_PreStdDev _UCL_PreMeans _UCL_PreStdDev	IM, MR	Mean, upper, and lower control limits based on pre-summarized group means or standard deviations.