---
tag: 0BWGTN92FG
kind: concept
name: Bias of an estimator
aliases: [bias, unbiased-estimator, estimator-bias]
msc: [62F10]
sources:
  - url: https://en.wikipedia.org/wiki/Bias_of_an_estimator
    locator: lead section
same_as:
  wikidata: Q11264527
  wikipedia: Bias of an estimator
---

## Summary

The bias of an estimator is the difference between its expected value and the true value of the quantity that it estimates. An estimator with zero bias is unbiased.
The node [[bias of an estimator|01BD2TFFP4]] gives the precise definition.