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An accent symbol placing a caret over theta, commonly used to denote parameter estimates in statistics and probability theory.

\hat{\theta} image

Examples

Maximum likelihood estimator notation

\hat{\theta} = \frac{1}{n}\sum_{i=1}^n x_i

Estimated angle in trigonometry or physics

\hat{\theta} = 30° \pm 2°

Statistical parameter estimation

P(|\hat{\theta} - \theta| < \epsilon) \geq 0.95