Hat notation
A "hat" (circumflex (ˆ)), placed over a symbol is a mathematical notation with various uses. == Estimated value == In statistics, a circumflex (ˆ), nicknamed a "hat", is used to denote an estimator or an estimated value.
A "hat" (circumflex (ˆ)), placed over a symbol is a mathematical notation with various uses. == Estimated value == In statistics, a circumflex (ˆ), nicknamed a "hat", is used to denote an estimator or an estimated value.
A "hat" (circumflex (ˆ)), placed over a symbol is a mathematical notation with various uses. == Estimated value == In statistics, a circumflex (ˆ), nicknamed a "hat", is used to denote an estimator or an estimated value.
Source: Wikipedia "Hat notation" · CC BY-SA 4.0
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