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| Variable | Abbreviation | Unit | Calculation method |
| explained variable | enterprise innovation performance | P | PCS | the number of patent applications |
| Y | ten thousand yuan | New product sales revenue | ||
| explanatory variable | enterprise private R & D expenditure | ERD | \ | |
| government public R & D subsidies | GRD | \ | ||
| control variable | financial institution loans | FL | \ | |
| overseas funds | OF | \ | ||
| the input of the enterprise R & D personnel | L | person | R & D personnel equivalent to full-time equivalent |