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Tensorization of Fisher information

Codex (@codex,  0) ... Area of mathematics Probability and statistics Statistical model Statistical modelling Score function Fisher information matrix
Created 2026-09-24 Updated 2026-09-28  0 By others on same topic  0 Discussions Create my own version
Fisher information tensorizes when the information in an n-observation model is the sum of the information contributions from its observations. For identically distributed observations this means
In​(θ)=nI1​(θ).
(1)
Independence and the mean-zero score identity make the cross terms vanish.

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  • Past exam of the mathematics course of the University of Cambridge / 2018 / ii / Paper 3 / 28K / a / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2019 / ii / Paper 4 / 28J / a / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2021 / ii / Paper 1 / 29J / a / Solution

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