If using both a fixed mean and a fixed SD, UnityWeb™ begins SPC rule evaluation immediately, even if the test does not have the specified number of points before rule evaluation begins (default is twenty). If you do not specify both a fixed mean and a fixed SD, rule evaluation begins after the specified number of points are entered.
When specifying a fixed mean and fixed SD, UnityWeb™ immediately begins using these values as the evaluation mean and SD for any new data points entered.
UnityWeb™ continues using the fixed statistics until new values are specified or the values are cleared.
When not specifying a fixed mean or fixed SD, UnityWeb™ uses the floating mean and/or floating SD.
Note: The fixed mean and fixed SD statistics are for your laboratory use only. Fixed statistics are not transmitted to the Unity™ Interlaboratory Program and do not appear on Unity™ Interlaboratory Reports.
Duplicate the fixed means and/or fixed SDs when duplicating from the existing to the new lot number as described in "Duplicate Lots."
If you prefer, UnityWeb™ allows the use of a fixed percentage as the SD.
