Bias (Statistics)

Bias measures how far the expected estimate is from the true value.

The bias = expected - real. For a given estimator $\hat{\theta }$ which estimates parameters $\theta$, the bias is given by:

$$\text{Bias}[\hat{\theta }]=\mathbb{E}[\hat{\theta }]-\theta$$

Also see Cognitive Bias.

Related

• Variance
• Bias - Variance Tradeoff
• Maximization Bias
• Mean Squared Error