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What does stationarity mean?

Looking for the meaning or definition of the word stationarity? Here's what it means.

Noun
  1. The condition of being stationary
  2. (mathematics) The condition of a series in which the value at all points is the same; the stationary value itself
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Examples
After having established the stationarity of the variables the production function was fitted.
The ADF, DF-GLS and NP test the null of unit root whereas the KPSS tests the null of stationarity.
Coefficients of the ARMA models are also checked for both stationarity and invertibility.
The composition stationarity test using the hymenopteran data was designed in a similar way, using just the 16S gene.
To ascertain nonstationarity or stationarity of time series variables, DF-GLS, Ng-Perron and KPSS tests are implemented.
Each variable also displays 1 behavior since first-differencing of level data restores stationarity, as shown above.

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