Index layer | Investment in environmental pollution control as a percentage of GDP | Forest cover rate | Research and experimental development expenditure as a percentage of GDP | Research and experimental development expenditure growth rate |
Investment in environmental pollution control as a percentage of GDP | 1 | 2 | 1 | 2/3 |
Forest cover rate | 1/2 | 1 | 1/2 | 1/3 |
Research and experimental development expenditure as a percentage of GDP | 1 | 2 | 1 | 2/3 |
Research and experimental development expenditure growth rate | 3/2 | 3 | 3/2 | 1 |
Weights R2ij | 0.2875 | 0.1187 | 0.2375 | 0.3563 |