The proportion of clues in subjective documents or expressions is their precision.
the precision of a set S with respect to opinion pieces is prec(S) = number of instances of members of S in opinion pieces total number of instances of members of S in the data The precision of a set S with respect to subjective elements is prec(S) = number of instances of members of S in subjective elements total number of instances of members of S in the data In the above, S is a set of types (not tokens).