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XCHART Statement |
The following notation is used in this section:
![]() | process mean (expected value of the population of measurements) |
![]() | process standard deviation (standard deviation of the population of measurements) |
![]() | mean of measurements in i th subgroup |
Ri | range of measurements in i th subgroup |
ni | sample size of i th subgroup |
N | number of subgroups |
![]() | weighted average of subgroup means |
zp | 100p th percentile of the standard normal distribution |
The following table provides the formulas for the limits:
Table 42.22: Limits forControl Limits |
LCL = lower limit ![]() |
UCL = upper limit ![]() |
Probability Limits |
LCL = lower limit ![]() |
UCL = upper limit ![]() |
Note that the limits vary with ni.
If standard values and
are available
for
and
, respectively, replace
with
and
with
in Table 42.22.
You can specify parameters for the limits as follows:
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