Estimator

Tags

PAS

Cegep/2

Word count

150 words

Reading time

1 minute

Formula to estimate a population parameter (target parameter) from sample data

[!abstract] Degrees of freedom
Number of values in an estimate of a parameter that are free to vary
Sym. $df$

Types

Point

Estimates the parameter at a point

[!abstract] Bias
Difference between the mean of a point estimator and the parameter it estimates

[!example]

• Sample mean is a point estimator of population mean.
• Sample variance is a point estimator of population variance.

Interval

Estimates the parameter in an interval

[!abstract] Confidence interval
Interval estimator with a level of certainty attached to it

[!abstract] Confidence coefficient
Probability that a confidence interval encloses the target parameter
Sym. $(1-\alpha )$

[!abstract] Confidence level
Confidence coefficient as a percentage
Sym. $(1-\alpha )\cdot 100\mathrm{\%}$

[!abstract] Margin of error
Half the width of a confidence interval
Syn. sampling error
Sym. $\mathrm{\Delta }$

Contributors

Ajitani Hifumi

Changelog

Last edited about 2 hours ago

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