Aggregation Effects And Panel Data Estimation Problems: An Investigationof the R&D Intensity Decision
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This paper considers why the determinants of the inter- and intra-industry variance in R&D intensity in U.S. manufacturing differ markedly even though response parameters are similar across industries. A similar aggregation effect is noted by Grunfeld and Griliches (1960), and this paper gives that
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美国国家经济研究局创建时间：
1979-05-01
