PatentsHGH  R Documentation 
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
Usage
data(PatentsHGH)
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 twodigit 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 19721979.
 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, 265283.
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.
See Also
PatentsRD
,
Index.Source
,
Index.Economics
,
Index.Econometrics
,
Index.Observations
,
Index.Time.Series