The logic for requiring stationarity is that models inferred from stationary series are also stationary or stable. |
To ascertain nonstationarity or stationarity of time series variables, DF-GLS, Ng-Perron and KPSS tests are implemented. |
Given the nature of time-series data, it is necessary to test the stationarity of each individual series. |
The ADF, DF-GLS and NP test the null of unit root whereas the KPSS tests the null of stationarity. |
After having established the stationarity of the variables the production function was fitted. |
The composition stationarity test using the hymenopteran data was designed in a similar way, using just the 16S gene. |