##  [Fisher Information](/fisher-information) 

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

  

 [![Natural & Formal Sciences Dictionary](/sites/default/files/styles/large/public/2026-01/Natural%20%26%20Formal%20Sciences.png.webp?itok=2kCDRVQv)](/topic-specific-dictionaries/natural-formal-sciences)



**Natural & Formal Sciences Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A nonnegative quantity associated with a parametric statistical model, defined as the expected value of the square of the score (derivative of log-likelihood) or equivalently the negative expected second derivative of the log-likelihood; it measures local sensitivity of the likelihood to parameter changes.