Table 4 The mean value of variables in different intervals of invention patents
|  | 80–90 | 70–80 | 60–70 | 50–60 | 50–40 | 40–30 | 30–20 | 10–20 | 1–10 |
|---|---|---|---|---|---|---|---|---|---|
Trade | 28.7 | 23.0 | 18.5 | 21.3 | 18.4 | 14.8 | 15.0 | 10.9 | 9.8 |
R | 2.7 | 5.1 | 12.4 | 13.7 | 15.2 | 12.5 | 20.4 | 22.2 | 22.7 |
E | 4.5 | 5.6 | 11.9 | 13.9 | 16.2 | 13.7 | 19.3 | 25.6 | 22.4 |
Trade 1 | 3.0 | 4.7 | 12.1 | 12.7 | 14.4 | 12.6 | 20.1 | 22.5 | 24.4 |