|Reference classes, philosophy: is the set of objects, situations, or even data for which an expression stands and which can be exchanged with each other while the meaning of the expression and the context of its use are preserved. The so-called reference class problem arises when the class of the possible data is so extensive or so designed that several interpretations are possible which mutually exclude each other. See also reference system, uniqueness, indeterminacy, probability theory.|
Books on Amazon
Reference class problem/Nozick: E.g. reliability: the reference class of beliefs can not exist in the beliefs acquired so far, because it may have been a coincidence so far that the method was reliable.
Philosophical Explanations Oxford 1981
The Nature of Rationality 1994