Co-integration and the term structure of Finnish short-term interest rates

The term structure of Finnish HELIBOR interest rates is studied by modelling it as a co-integrated system. There are three co-integrating vectors among the six rates. They can be identified as the spreads between the two and one and three and one month rates, and a third vector tending to keep the yield curve linear. Co-integration analysis of partial systems suggests that it is only for the three shortest-term yields that the expectations hypothesis cannot be rejected. Recursive analysis reveals that the co-integratioll space has changed in time, which is not surprising given the changes in monetary policy regimes.