On the Qualitative Analysis of Econometric Models
نویسندگان
چکیده
In this paper, I review a number of techniques which are based on the qualitative features of an econometric model (presence of a variable in a relationship .) The issues addressed span from the reconstruction of the theoretical structure behind the model speciication (which is oftentimes lost as the size of the model increases) to the possibility of reordering the equations aimed at achieving more eecient solution, to the analysis of the dynamic structure of the model, including an analysis of the maximum number of eigenvalues possible within a structure. A discussion of the role of model reparameter-ization and of the disturbance term is proposed. Extensions are examined when more information of a qualitative nature, such as the sign pattern of the partial derivatives or an artiicial intelligence approach are considered. A connection to VAR model analysis is suggested in order to trace the channels of the impulse{response function. Without implicating them for the aws in this presentation, thanks are due to Giorgio Calzolari, Mario Faliva and Manfred Gilli for their comments and encouragement at various stages of this research.
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