When the Bypass for a subgroup is set to Include on charts and data lists only, the subgroup will not be included in any of the statistical calculations for values such as Total Subgroups, Cpk, etc. However, additional statistics provide information on the subgroups that were bypassed in a retrieval:
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See Statistics identification code numbers for a full list of the statistics available.
To better understand the difference between bypassing a data point and excluding statistical outliers, consider the following example:
A retrieval set to exclude outliers retrieves 40 subgroups, one of which is an outlier and one of which is bypassed. The resulting statistics will include:
Statistic |
Value |
Explanation |
Total subgroups |
40 |
|
Bypassed subgroups |
1 |
|
Total subgroups |
39 |
40 minus 1 bypassed |
Excluded subgroups |
1 |
|
Good subgroups |
38 |
40 minus (1 bypassed + 1 statistical outlier) |