+--------------+-------------------+
| 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 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 <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
~~~~~~~~

``Index.Source``, ``Index.Economics``, ``Index.Econometrics``,
``Index.Observations``,

``Index.Time.Series``
