INVARIANT FISHER INFORMATION

被引:1
作者
NOGUCHI, M [1 ]
机构
[1] MEIJO UNIV,DEPT COMMERCE,DIV ECON,TENPAKU KU,NAGOYA,AICHI 468,JAPAN
关键词
FISHER INFORMATION; CONNECTION; FIBER BUNDLE;
D O I
10.1016/0926-2245(94)00013-1
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
Let t = t(p, omega) : M x OMEGA --> R(k) be a family of R(k)-valued random variables parametrized by a n-dimensional manifold M, where x = (x1,...,x(n)) is a chart around p is-an-element-of M, OMEGA a probability space and omega is-an-element-of OMEGA. Assuming t possesses a density p(p, t), the Fisher information associated with t is defined to be g(p) = = epsilon(p)[partial derivative(i)l)(partial derivative(j)l)]dx(i) X dx(j) where epsilon(p) is the expectation with respect to rho(p, t), l(p, t) = log rho(p, t) and partial derivative(i) = partial derivative/partial derivative x(i). g(p) is, by definition, invariant under a change of parameters x --> x' and also a change of random variables of the form t = t(t'). However, it may not be invariant under a general change of random variables t = t(p,t'). The aim of this paper is to construct information g(inv)(p) which is invariant under a general change of both parameters and random variables. We can, in the end, express the difference g(inv)(P) - g(P) in terms of two types of connections which are purely geometrical objects. If we further impose a certain ''linearity'' on our construction, we can express g(inv)(p) - g(p) in terms of a single linear connection on a vector bundle so that the vanishing of the curvature would insure the existence of a ''special'' t in which g(inv)(p) = g(p) holds.
引用
收藏
页码:179 / 199
页数:21
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