摘要：In some point estimation problems, we may confront imprecise
(fuzzy) concepts. One important case is a situation where all observations
are fuzzy rather than crisp. In this paper, using fuzzy set theory, we define a
fuzzy-valued random variable, a fuzzy unbiased estimator, a fuzzy exponential
family, and then we state and prove a Cram¡äer-Rao lower bound for such
fuzzy estimators. Finally, we give some examples.
