摘要：Any unperturbed and perturbed posterior density can formally be
linked by a mixture. Many divergences between the unperturbed and perturbed
posterior density - global measures of inuence of the perturbation - are then essen-
tially determined by the Fisher information with respect to the mixing parameter
evaluated at the unperturbed density. It is investigated which aspect of change
this Fisher information - commonly interpreted as local measure of inuence -
captures in assessing inuence of the perturbation. Under multiplicative modes
of perturbation it is nicely interpretable as unperturbed posterior variance of the
(log-)perturbation function.
