Some logical structures for combining concept dimensions are much rarer than their converses.

Evidence

The fourth alternative in table 2.4 uses AND at the indicator level with OR at the secondary level. This appears to be a relatively uncommon concept structure. Perhaps the popularity of its converse-OR at the indicator level with AND at the secondary level-partially explains this rarity. In chapter 9 on concepts in theories we shall see that the AND/indicator-level, OR/secondary-level structure is very common 10Chapter 8 provides another very important example, the concept of “politically relevant dyads” which plays a major role in research design in large-N studies of international conflict; see figure 8. — Gary Goertz, Social Science Concepts, 338

Categorization

• QUESTION: Why would OR-at-secondary, AND-at-indicator be so rare while its converse is widespread? Goertz defers the answer to chapter 9 on concepts in theories — worth chasing there.