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This paper examines the evidence on the clustering of innovators within the telecommunications sector, using U.S. patent citation data to trace their locations over time. While clustering is clearly evident, we use multivariate left-censored Tobit regression analysis to control for identifiable factors, showing that the distance between successive innovators has been rising over time, perhaps even...
Real-time process-control computer technology can now be effectively utilized to facilitate experimental research in the social sciences. The impact of such technology on the quality of experimental research in behavioral science laboratories suggests that computer-controlled experimentation is of as great a use in the social sciences as it has become in the physical sciences. This paper summarizes...
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