a panel of 346 observations from 1975 to 1979

*number of observations* : 1730

*observation* : production units

*country* : United States

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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)

Hall, Bronwyn , Zvi Griliches and Jerry Hausman (1986) “Patents and R&D: Is There a Lag?”, *International Economic Review*, **27**, 265-283.

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.

`Index.Source`

, `Index.Economics`

, `Index.Econometrics`

, `Index.Observations`

,

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