Econometrica: Apr 1965, Volume 33, Issue 2
Near-Identifiability and the Variances of the Disturbance Terms
Franklin M. FisherThis paper provides a rigorous generalization of the well-known intuitive result that an equation in a two-equation model is in some sense identified if the variance of its disturbance is small relative to that of the other disturbance. The theorem is proved for the many-equation case.
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