A function of the observations having a distribution that does not depend on any parameter other than the parameter of interest. For example, if a random sample of n observations is taken from a normal distribution with unknown mean μ and variance σ2 then a pivotal quantity for the parameter μ is the statistic t, given by
where x̄ is the sample mean and s2 is the sample variance (calculated using the (n−1) divisor). The distribution of t (a t-distribution with (n−1) degrees of freedom) does not depend on the value of σ2.
- mean
- mean absolute deviation
- mean absolute error
- mean absolute percentage error
- mean anomaly
- mean chart
- mean current density
- mean curvature
- mean daily motion
- mean density of matter
- meander
- meander belt
- meander core
- meander migration
- meander neck
- meander scroll
- meander wavelength
- mean deviation
- mean equator
- mean equinox
- mean field theory
- mean free path
- mean free time
- mean hydraulic depth
- mean hydraulic diameter