Discussion Paper
Model Selection in Partially Nonstationary Vector Autoregressive Processes with Reduced Rank Structure
The current practice for determining the number of cointegrating vectors, or the cointegrating rank, in a vector autoregression (VAR) requires the investigator to perform a sequence of cointegration tests. However, as was shown in Johansen (1992), this type of sequential procedure does not lead to consistent estimation of the cointegrating rank.