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The outcomes of the correlation matrix.
| Variables | Pre COVID-19 |
Post-COVID-19 |
||||
|---|---|---|---|---|---|---|
| Oil | Natural gas | Coal | Oil | Natural gas | Coal | |
| Oil | 1.00 | – | – | 1.00 | – | – |
| Natural gas | 0.95 | 1.00 | – | 0.87 | 1.00 | – |
| Coal | 0.58 | 0.56 | 1.00 | 0.74 | 0.64 | 1.00 |
Source: Author's calculation.
