Patents {Ecdat}R Documentation

Number of Patents for International Manufacturig Firms

Description

a cross-section from 1990–1991

number of observations : 181

observation : production units

country : world

Usage

data(Patents)

Format

A dataframe containing :

p91
number of patents in 1991
p90
number of patents in 1990
lr91
log R&D expenditures 1991
lr90
log R&D expenditures 1990
industry
a factor with levels (aerospace,chemistry,computer,machinery_and_instruments,motor_vehicles)
country
a factor with levels (japan,us,other)

Source

Cincera, M. (1997) “Patents, R&D, and technological spillovers at the firm level : some evidence from econometric count models for panel data”, Journal of Applied Econometrics , 12, 265–280.

References

Verbeek, Marno (2004) A guide to modern econometrics, John Wiley and Sons, http://www.econ.kuleuven.ac.be/GME, chapter 7.

See Also

Index.Books, Index.Economics, Index.Econometrics, Index.Observations


[Package Ecdat version 0.1-4 Index]