Jain's pencil-of-functions method based on the linear dependence/independence of a set of functions is revisited. It is shown that no matter what model order is chosen, every estimated denominator coefficient may be regarded as the geometric mean of two values obtained in a least-squares sense.
['Pascale Bréhonnet', 'Riwal Morvan', 'Pierre Vilbé', 'Léon-Claude Calvez']
Novel interpretation of the pencil-of-functions approximation/identification method