| Coefficients of the ARMA models are also checked for both stationarity and invertibility. |
| The analysis begins by investigating the order of integration of the respective variables using a battery of unit root and stationarity tests. |
| Each variable also displays 1 behavior since first-differencing of level data restores stationarity, as shown above. |
| A stationarity requirement, defined as a constant mean, variance and autocorrelation through time, constrains parameters to a certain range. |
| 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. |
