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Generalized Rational Random Errors AgEcon
LaFrance, Jeffrey T..
Theil's theory of rational random errors is sufficient for strict exogeneity of group expenditure in separable demand models. Generalized rational random errors is necessary and sufficient for strict exogeneity of group expenditure. A simple, robust, asymptotically normal t-test of this hypothesis is derived based on the generalized method of moments. An application to per capita annual U.S. food demand in the 20th century strongly rejects exogeneity of food expenditure in a model that in all other respects is highly compatible with the data set and with the implications of economic theory.
Tipo: Working or Discussion Paper Palavras-chave: Demand; Generalized method of moments; Rational random errors; Weak separability; Demand and Price Analysis.
Ano: 2002 URL: http://purl.umn.edu/25053
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TESTING AGGREGATION WITHOUT SEPARABILITY IN MEAT DEMAND: AN INVESTIGATION OF THE GENERALIZED COMPOSITE COMMODITY THEOREM AgEcon
Davis, George C..
In the estimation of aggregate meat demand systems, weak separability is often a maintained assumption. However, only a few studies have tested and failed to reject this assumption. Recently, Lewbel (1996) developed a generalized composite commodity theorem (GCCT) that is less restrictive than weak separability. In this study, a data set in which the weak separability conditions for aggregation have been rejected is reconsidered to determine if aggregation can be based on the GCCT. Some subtleties of Lewbel's testing procedure that are not discussed by Lewbel are considered, and the fundamental problem of formulating aggregates prior to conducting tests for aggregation is addressed.
Tipo: Conference Paper or Presentation Palavras-chave: Aggregation; Demand; Weak separability; Generalized composite commodity theorem.; Demand and Price Analysis; Livestock Production/Industries.
Ano: 1998 URL: http://purl.umn.edu/20895
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Using Weak Separability and Generalized Composite Commodity Theorem in Modeling Ground Beef Demand AgEcon
Schulz, Lee L.; Schroeder, Ted C.; Xia, Tian.
Replaced with revised version of paper 06/15/11.
Tipo: Conference Paper or Presentation Palavras-chave: Aggregation; Generalized Composite Commodity Theorem; Beef demand; Weak separability; Demand and Price Analysis; Q13; Q18; R32.
Ano: 2011 URL: http://purl.umn.edu/103904
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