UN                      United Nations Vote Data
oc                      Optimal Classification Roll Call Scaling
plot.OCangles           Optimal Classification Cutting Line Angles Plot
plot.OCcoords           Optimal Classification Coordinate Plot
plot.OCcutlines         Optimal Classification Cutline Plot
plot.OCobject           Optimal Classification Summary Plot
plot.OCskree            Optimal Classification Skree Plot
sen90                   90th U.S. Senate Roll Call Vote Matrix
sen90oc                 90th U.S. Senate Ideal Points via Optimal
                        Classification
summary.OCobject        Optimal Classification Summary
