And that is where things get interesting, for some theories about what dark matter is made of suggest its particles are their own antiparticles.
Data of the commensurate size and shape needed to validate a big theory is often either merely unattainable, too expensive to derive, too elusive to observe, and, for some theories, it may simply be unclear what would so much as count as appropriate data in the first place.
These mysteries remain unexplained even today, except for some theories that say that this was an ancient alien city.
Hence the choice will often favor a single indicator controlling for some theory-relevant feature rather than multiply entrenching a particular latent.
Thinking about how a system works is always necessary, but for some theories, quantitative features of the theory must be explored so that the magnitude of effects can be evaluated, and the exact conditions under which they occur can be found.
8.44pm / 1.44am: Both the librarian and Cornel have the same approach to asking questions: bang on for hours about some theory they have about Jay-Z's music, and not actually ask a question.
Here it is of less importance whether the symbolic representations are based on some presumed logical semantics for language, or some theory of mental representation as long as they are representations that can be reasoned with.
Consider, for instance, some theories that are clearly intended as alternatives to teleosemantics, such as Fodor's (1990b) asymmetric dependency theory or theories that appeal to convergence under ideal epistemic conditions (see Rey 1997 for an outline).
