  Peirce’s earliest account of the meaning of probability, then, is a version of what is called the “long run relative frequency view” of probability. Late in his philosophical career, about 1910, Peirce found fault with his earliest views on account of their failure to make clear just how the occasions of observation are to be chosen.  He also emphasized that probability judgments are judgments about what he called “would-be’s.” For this reason Peirce is often considered to be the originator of the sort of “propensity view” of probability that is associated with Karl Popper. One should not, however, think that viewing Peirce as a propensity theorist is in conflict with viewing him as some sort of long term relative frequency theorist. Rather, Peirce’s view seems to be that the propensity in question, when its sense is spelled out in accord with the pragmatic (or: pragmaticistic) theory of meaning, is a dispositional property that manifests itself in the set of concrete facts that amount to a certain long term relative frequency tending toward a certain limit as the number of appropriate occasions of observation increases indefinitely.