#### Calculation list

This list is only available for these auto features: Circle and Cylinder | The Calculation list in the Advanced Measurement Options area allows the user to specify how he or she would like the feature calculated from the measured hits. The available options are: LEAST_SQR, MIN_SEP, MAX_INSC, MIN_CIRCSC, and FIXED_RAD.

For legacy Circularity and Cylindricity dimensions as well as a Location dimension's RN Line, the feature solution is used to compute the dimension. By default this is Least Squares. However, you can choose to solve the feature using Minimum Separation, Maximum Inscribed, Minimum Circumscribed, or Fixed Radius regression algorithms.
FCF Circularity and Cylindricity dimensions on the other hand are computed using the Chebychev algorithm (Min/Max) as required by the Y14.5 standard. Because of the change in calculation, Circularity and Cylindricity FCF dimensions will generally compute to a slightly smaller value than their legacy counterparts.

These calculation types are already discussed in detail in the "Best Fit Type" topic in the "Constructing New Features from Existing Features" chapter.