The Projection Quality Index
James E. Perone · Interface · 1988
Although much has been written in the 30‐year history of set‐theory about similarity relationships between set‐types, studies of this kind have generally focussed either on the inclusion relationship or on the relationship of interval‐class contents. In this paper, I propose a system of comparing set‐types of different sizes using both the inclusion relationship and that of interval‐class relationships.