Two Models of Measurements and the Investment Accelerator

Thomas Sargent

Journal of Political Economy, 1989, vol. 97, issue 2, 251-87

Abstract: This paper describes two models of an agency that is collecting and reporting observations on a dynamical linear stochastic economy. The first is a "classical" model, with the agency reporting data that are the sum of a vector of "true" variables and a vector of measurement errors that are orthogonal to the true variables. The second is a model of an agency that uses an optimal filtering method to construct least-squares estimates of the true variables. These two models of the reporting agency imply different likelihood functions. A model of the investment accelerator is used as an example to illustrate the differing implications of the models. Copyright 1989 by University of Chicago Press.

Date: 1989
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