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Handling the measurement error problem by means of panel data: Moment methods applied on firm data

By Erik Biørn


The estimation of a linear equation from panel data with measurement errors is considered. The equation is estimated (I) by methods operating on the equation in differenced period means, and (II) by Generalized Method of Moments (GMM) procedures using (a) the equation in differences with instruments in levels and (b) the equation in levels with instruments in differences. Both difference transformations eliminate unobserved individual heterogeneity. Examples illustrating the input response to output changes for materials and capital inputs from an eight year panel of Norwegian manufacturing firms, are given.Panel Data. Errors-in-Variables. GMM Estimation. Factor Demand. Returns to scale

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