• Publications
  • Influence
Patent Statistics as Economic Indicators: a Survey
This survey reviews the growing use of patent data in economic analysis. After describing some of the main characteristics of patents and patent data, it focuses on the use of patents as an indicatorExpand
  • 5,492
  • 395
  • PDF
Issues in Assessing the Contribution of Research and Development to Productivity Growth
This article outlines the production function approach to the estimation of the returns to R&D and then proceeds to discuss in turn two very difficult problems: the measurement of output in R&DExpand
  • 3,642
  • 284
The Search for R&D Spillovers
R&D spillovers are, potentially, a major source of endogenous growth in various recent "New Growth Theory" models. This paper reviews the basic model of R&D spillovers and then focuses on theExpand
  • 2,394
  • 172
  • PDF
Econometric Models for Count Data with an Application to the Patents-R&D Relationship
This paper focuses on developing and adapting statistical models of counts (non-negative integers) in the context of panel data and using them to analyze the relationship between patents and R&DExpand
  • 3,306
  • 166
  • PDF
Changes in the Demand for Skilled Labor within U. S. Manufacturing: Evidence from the Annual Survey of Manufactures
This paper investigates the shift in demand away from unskilled and toward skilled labor in U. S. manufacturing over the 1980s. Production labor-saving technological change is the chief explanationExpand
  • 1,847
  • 127
  • PDF
Market Value, R&D, and Patents
Abstract A significant relationship is found between the market value of the firm and its ‘intangible’ capital, proxied by past R&D expenditures and the number of patents, based on a time-seriesExpand
  • 928
  • 104
Errors in Variables in Panel Data
TLDR
Panel data based on various longitudinal surveys have become ubiquitous in economics in recent years. Expand
  • 1,593
  • 95
  • PDF
Production Functions: The Search for Identification
Some aspects of the econometric estimation of production functions are discussed, focussing primarily on the issue of simultaneity and reviewing the stream of criticisms of Douglas' work and theExpand
  • 1,194
  • 76
  • PDF
...
1
2
3
4
5
...