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

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.

Referenced top top|Alpha: Hat

Weisstein, Eric W. "Hat." indigenous web Resource. Https:// net Resources

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