In the above example, we employed score normalisation, hence the scores of 0.5 for the two alternation candidates from (3b) to 3aOne other area in which the described formulation is lacking, is that it has no way of determining the frequency of each case frame, and hence the relative conspicuousness of any alternations between them.
we want to be able to say that alternating case frames in common use will produce greater salience for that alternation than alternations between rarely-occurring case frames.