The hat is a caret-shaped symbol commonly placed on peak of variables to provide them one-of-a-kind meaning. The symbol

*
is voiced "
*
-hat" (or periodically as "
*
-roof") in mathematics, yet is more commonly known as the circumflex in grammars (Bringhurst 1997, p.274).

You are watching: What does the hat mean in statistics

Uses of the cap in math include:

1. To signify a unit vector (e.g.,

*
) or an estimator (e.g.,
*
).

2. To signify an estimator, e.g.,

*
for the sample mean.

3. As the growth rate that

*
in cap calculus, e.g.,
*
(Jones 1965, who but used the prize
*
rather of a hat).


SEE ALSO: Bar, Caret, Estimator, Macron, Unit Vector
REFERENCES:

Bringhurst, R. The aspects of Typographic Style, second ed. Suggest Roberts, WA: Hartley and also Marks, 1997.

Jones, R.W. "The structure of straightforward General Equilibrium Models."J. Pol. Econ. 73, 557-572, 1965.


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Weisstein, Eric W. "Hat." indigenous lifwynnfoundation.org--Alifwynnfoundation.org web Resource. Https://lifwynnfoundation.org/Hat.html


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