초록 |
This paper aims to review Cox-Chavas nonparametric model of technical change and discuss its variance issues which are related to the measurement unit of data, choice of objective function coefficients and index formula of data aggregation. In applied researches, neither models nor data sets are complete. Thus, the results of applied model are always conditional to the model assumptions and data sets. However, the interpretations and implications derived from the results should be meaningful.
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