Description Usage Arguments Value Author(s) References See Also
These functions are used to compute statistics required by the np chart.
1 2 3 |
data |
the observed data values |
center |
sample/group center statistic. |
sizes |
samples sizes. |
std.dev |
within group standard deviation. |
conf |
a numeric value used to compute control limits, specifying the number of standard deviations (if |
... |
further arguments are ignored. |
The function stats.np
returns a list with components statistics
and center
.
The function sd.np
returns std.dev
the standard deviation of the statistic charted.
The function limits.np
returns a matrix with lower and upper control limits.
Luca Scrucca
Montgomery, D.C. (2005) Introduction to Statistical Quality Control, 5th ed. New York: John Wiley & Sons.
Wetherill, G.B. and Brown, D.W. (1991) Statistical Process Control. New York: Chapman & Hall.
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