Abstract
either specified to be additive or multiplicative.3 Although there are instances in which there may be compelling a priori reasons for specifying the error as being of a particular type,4 the multiplicative choice is typically made on grounds of computational convenience. The primary purpose of this paper is to introduce a more general model permitting both additive and multiplicative errors. We first present a method of estimation devised to account simultaneously for additive and multiplicative errors. We then illustrate the method on several simple and artificial examples. Finally, we indicate the workability of this new method by computing estimates for two alternative travel demand functions.
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