Table 2 Calculation methods and descriptive statistics of variables
From: The impact of carbon emission trading policy on firms’ green innovation in China
Variable | Calculation method | Observations | Mean | SD | Min | Max |
|---|---|---|---|---|---|---|
Gpatent | ln(number of green invention patent applications) | 26,002 | 0.512 | 0.941 | 0 | 7.224 |
Age | ln(company age) | 25,997 | 2.821 | 0.354 | 1.610 | 3.466 |
Scale | ln(company size) | 25,702 | 22.096 | 1.314 | 19.296 | 26.069 |
Dar | Company total liabilities/total assets | 25,702 | 0.447 | 0.217 | 0.054 | 0.987 |
Roe | Company net profit/net assets | 25,458 | 0.060 | 0.145 | − 0.787 | 0.376 |
Tat | Company sales revenue/total assets | 25,701 | 0.647 | 0.457 | 0.047 | 2.639 |
Cr | Company total current assets/total current liabilities | 25,702 | 2.375 | 2.656 | 0.187 | 17.805 |
Qr | Company total quick assets/total current liabilities | 25,702 | 1.906 | 2.449 | 0.125 | 16.371 |
Mfr | Company management expenses/main business income | 25,698 | 0.102 | 0.101 | 0.009 | 0.713 |