how do exponential families have effective estimators what is the optimal estimator for the variance of a gaussian model which exponential family always has an efficient estimator? which type of estimator is an efficient estimator? unbiased exponential family which gaussian model always has an efficient estimator what is the efficient estimator for gaussian what is the unbiased estimator of variance for a gaussian model which exponential family has efficient estimators which exponential family is efficient which family always produces an efficient estimator which equation is an efficient estimator of variance which exponential family has an efficient estimator of variance? which family has efficient estimators what is the optimal value for an efficient estimator in ghassian what gaussian model always has an efficient estimator why is a gaussian estimator useful which exponential family of gaussian models always has an efficient estimator? what is the best value for the efficient estimator does exponential family have an efficient estimator