  For many years, at least since McCarthy and Hayes (1969), writers have
lamented, and attempted to compensate for, the alleged fact that we often do
not have adequate statistical knowledge for governing the uncertainty of
belief, for making uncertain inferences, and the like. It is hardly ever
spelled out what "adequate statistical knowledge" would be, if we had it, and
how adequate statistical knowledge could be used to control and regulate
epistemic uncertainty.
