| As an econometrician I have my doubts about the ratio of a non-stationary quantity and a stationary one. |
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| The common approach used in dealing with non-stationary time series is natural logarithm as a form of transformation in the analysis. |
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| Even though a given set of series may be non-stationary, there may exist a linear combination of the individual series that are stationary. |
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| He uses Navier-Stokes equations that achieve linearizations for the case of non-stationary and harmonic motions, as mathematical tools to study real classes of problems. |
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| Two kinds of neural networks for identification of non-stationary parameters of caterpillar and its turn control system are synthesized and tested. |
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