 that is, the limiting frequency for \(G\) in \(F\)-and-\(H\) differs from the limiting frequency for \(G\) in \(F\)-and-not-\(H\). Properties whose presence does not make a difference to the limiting frequency for the occurrence of \(G\) in \(F\) would therefore qualify as statistically irrelevant. Relative frequencies were typically relied upon in practice, but in principle they had to be limiting.