Table 1 Variables in the study.

From: Revisiting the Porter hypothesis: a multi-country meta-analysis of the relationship between environmental regulation and green innovation

Variable

Definition

OVR

Overall regulation

CACR

Command and control regulation

MIR

Market incentive regulation

VR

Voluntary regulation

ORS

Other regulations

NOPS

Number of patents

FOT

Frequency of terms mentioned in the annual report

NPSR

New product sales revenue

RDER

R&D expenditure/revenue

QGI

Questionnaire measures regarding green innovation

EBI

Energy-based indices

PBI

Pollution-based indices

OMS

Other measures