Jungbacker, Borus; Koopman, Siem Jan; Wel, Michel van der - School of Economics and Management, University of Aarhus - 2009
We consider the dynamic factor model and show how smoothness restrictions can be imposed on the factor loadings. Cubic spline functions are used to introduce smoothness in factor loadings. We develop statistical procedures based on Wald, Lagrange multiplier and likelihood ratio tests for this...