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. |