pglm (version 0.2-2)

PatentsRDUS: Dynamic Relation Between Patents and R\&d

Description

yearly observations of 346 production units

number of observations : 3460

country : United States

economic topic : industrial economics

econometrics topic : count data

Usage

data(PatentsRDUS)

Arguments

Format

A dataframe containing :

cusip

compustat's identifying number for the firm

year

year

ardssic

a two-digit code for the applied R&D industrial classification

scisect

is the firm in the scientific sector ?

capital72

book value of capital in 1972

sumpat

the sum of patents applied for between 1972-1979

rd

R&D spending during the year (in 1972 dollars)

patents

the number of patents applied for during the year that were eventually granted

References

http://cameron.econ.ucdavis.edu/racd/racddata.html, chapter 9..