Open Access
Table 4
Correlation indicators of variables with respect to each other used in the present study.
| Item | CO2 emission | Years | Vehicle kilometer | GDP | Population | Energy consumption |
|---|---|---|---|---|---|---|
| CO2 emission | 1 | – | – | – | – | – |
| Years | 0.95643 | 1 | – | – | – | – |
| Vehicle kilometer | 0.96875 | 0.94666 | 1 | – | – | – |
| GDP | 0.92063 | 0.90058 | 0.95352 | 1 | – | – |
| Population | 0.96002 | 0.99971 | 0.94980 | 0.89928 | 1 | – |
| Energy consumption | 0.98563 | 0.94117 | 0.98639 | 0.93364 | 0.94556 | 1 |
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