Westgard et al have developed a series of rules for evaluating controls which can be used to judge if the data from an analysis is acceptable. The results of the rule analysis can be employed sequentially in a multirule Shewhart procedure to determine whether to accept or reject an analytic run.
Westgard Rule Failed?
Yes
No
1:2S
go to next rule
in control, accept run
1:3S
out of control, reject run
go to next rule
2:2S
out of control, reject run
go to next rule
R:4S
out of control, reject run
go to next rule
4:1S
out of control, reject run
go to next rule
10:X
out of control, reject run
in control, accept run
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