# Fisher Information

> Source: https://sukruyusufkaya.com/en/glossary/fisher-bilgisi
> Updated: 2026-05-13T21:07:55.617Z
> Type: glossary
> Category: matematik-istatistik-optimizasyon
**TLDR:** A statistical quantity that measures how much precise information the observed data carries about a model parameter.

<p>Fisher information helps us understand how precisely a parameter can be estimated from data. If the data is highly sensitive to small changes in a parameter, Fisher information is high, meaning the data carries sharper information about that parameter. This concept is important for understanding theoretical estimation limits, uncertainty levels, and certain optimization approaches. It measures not just whether information exists, but how sharp that information is at the parameter level. Fisher information allows for a more refined statistical intuition.</p>