PatentsHGH: Dynamic Relation Between Patents and R\&D
Description
a panel of 346 observations from 1975 to 1979 number of observations : 1730
observation : production units
country : United States
Format
A dataframe containing :
- obsno
- firm index
- year
- year
- cusip
- Compustat's identifying number for the firm (Committee on Uniform Security Identification Procedures number)
- ardsic
- a two-digit code for the applied R&D industrial classification (roughly that in Bound, Cummins, Griliches, Hall, and Jaffe, in the Griliches R&D, Patents, and Productivity volume)
- scisect
- is the firm in the scientific sector ?
- logk
- the logarithm of the book value of capital in 1972.
- sumpat
- the sum of patents applied for between 1972-1979.
- logr
- the logarithm of R&D spending during the year (in 1972 dollars)
- logr1
- the logarithm of R&D spending (one year lag)
- logr2
- the logarithm of R&D spending (two years lag)
- logr3
- the logarithm of R&D spending (three years lag)
- logr4
- the logarithm of R&D spending (four years lag)
- logr5
- the logarithm of R&D spending (five years lag)
- pat
- the number of patents applied for during the year that were eventually granted
- pat1
- the number of patents (one year lag)
- pat2
- the number of patents (two years lag)
- pat3
- the number of patents (three years lag)
- pat4
- the number of patents (four years lag)
Source
Hall, Bronwyn , Zvi Griliches and Jerry Hausman (1986) “Patents and R&D: Is There a Lag?”, International Economic Review, 27, 265-283. References
Cameron, A.C. and Trivedi P.K. (1998) Regression analysis of count data, Cambridge University Press, http://cameron.econ.ucdavis.edu/racd/racddata.html, chapter 9. Cameron, A.C. and P.K. Trivedi (2005) Microeconometrics : methods and applications, Cambridge, pp. 792--5.