##  [Fisher Information Principle](/index.php/fisher-information-principle) 

  ##  [Fisher Information Principle](https://information.quantumdictionary.io/fisher-information-principle-0) 

  

 [![Information & Communication Dictionary](/sites/default/files/styles/large/public/2026-01/Information%20%26%20Communication.png.webp?itok=g4emS-T7)](/index.php/topic-specific-dictionaries/information-communication)



**Information & Communication Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A measure of how sensitively a probability model's likelihood responds to changes in a parameter; formally, for a parametric model the Fisher information equals the expected value (under the model) of the squared score (derivative of the log-likelihood).