Format
A dataframe containing :
- year
- year
- fi
- firm's id
- sector
- firm's main industry sector, one of aero (aerospace), chem (chemistry), comput (computer), drugs, elec (electricity), food, fuel (fuel and mining), glass, instr (instruments), machin (machinery), metals, other, paper, soft (software), motor (motor vehicules)
- geo
- geographic area, one of eu (European Union), japan, usa, rotw (rest of the world)
- patent
- numbers of European patent applications
- rdexp
- log of R\&D expenditures
- spil
- log of spillovers
Source
Cincer, Michele (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(3), may--june, 265--280.