Key points are not available for this paper at this time.
This note discusses a few issues related to Yager's specificity index and the “possibilistic entropy” recently introduced by Higashi and Klir. A probabilistic interpretation of Yager's index is provided; moreover it is indicated that both indices can be straightforwardly extended to assess the amount of imprecision in Shafer's belief functions.
Dubois et al. (Fri,) studied this question.