We provide numerically reliable analytical expressions for the score of conditionally heteroskedastic dynamic regression models when the conditional distribution is multivariate $t$. We also derive one-sided and 2-sided LM tests for multivariate normality versus multivariate $t$ based on the...

This paper analyses the term premia in the Spanish public debt market over the period from January of 1991 to December of 1995. The purpose is to determine the hypothesis that explains the relationship between short-term and long-term interest rates in the Spanish public debt market. We obtain...