If using both a fixed mean and a fixed SD, Unity Real Time™ online 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, Unity Real Time™ online immediately begins using these values as the evaluation mean and SD for any new data points entered.
Unity Real Time™ online continues using the fixed statistics until new values are specified or the values are cleared.
When not specifying a fixed mean or fixed SD, Unity Real Time™ online 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, Unity Real Time™ online allows the use of a fixed percentage as the SD.
