For a best fit (BF) or best fit recompensate (BFRE) circle, you can choose to remove outliers based on the distance from the best fit feature. This allows the removal of anomalies that arise in the measurement process.
PC-DMIS first fits a circle to the data, then determines which points are outliers based on the standard deviation multiple. It then does the following:
Recalculates the best fit circle with those outliers removed.
Checks for outliers again.
Recalculates the best fit circle.
Continues repeating this process until no more outliers exist or until PC-DMIS cannot compute the circle (PC-DMIS can't compute the circle if there are fewer than three data points).