Quality and Reliability Methods - SAS

48 Statistical Control Charts Chapter 2
Saving and Retrieving Limits
Table 2.3 Limits Table Keys with Appropriate Charts and Meanings (Continued)
Key Words For Chars Meaning
_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- lower and upper control limit for Mean
Chart, Individual Measurement chart, or
any attribute 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
_Head Start CUSUM head start for one-sided scheme
_Two Sided, _Data Units CUSUM type of chart
_H, _K CUSUM alternative to alpha and beta; K is optional
_Delta
_Beta
_AvgR_PreMeans
_AvgR_PreStdDev
_LCLR_PreMeans
_LCLR_PreStdDev
_UCLR_PreMeans
_UCLR_PreStdDev
_Avg_PreMeans
_Avg_PreStdDev
_LCL_PreMeans
_LCL_PreStdDev
_UCL_PreMeans
_UCL_PreStdDev
CUSUM
IM, MR
Absolute value of the smallest shift to be
detected as a multiple of the process
standard deviation or standard error
probability and are available only when
_Alpha is specified.
Mean, upper and lower control limits based
on pre-summarized group means or
standard deviations.