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Non-Stationary process can be analyzed and there are various models available that can be used . For example, Autoregressive Integrated Moving Average model (ARIMA) models are used to explain homogeneous non-stationary models as well as random walk with drift can be used for explaining several such series. have a look at this link : ...


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I would say that you can use Johansens methods to test for rank of co-integration matrix. There are tests for that. If there is no co-integration vector present and both series are I(0) then there is no co-integration. Series still might have some short-run dynamics. If series are I(1) and no con-integration vector is present then modeling these series by ...



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