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Table 5 Bivariate correlation coefficients for the whole experimental variables

From: Engine drive and environmental characteristics when fuel mixed with waste cooking oil is used for a small diesel engine

  1. 2. 3. 4. 5. 6. 7. 8. 9.
1. rpm 1 − 0.056 − 0.059 0.059 0.079 0.050 0.070 0.083 0.084
2. Exhaust temperature   1 0.868** − 0.868** − 0.657** − 0.856** − 0.786** − 0.793** − 0.793**
3. O2    1 − 1.000** − 0.805** − 0.988** − 0.934** − 0.938** − 0.938**
4. CO2     1 0.805** 0.988** 0.934** 0.938** 0.938**
5. NO      1 0.799** 0.960** 0.899** 0.899**
6. NO2       1 0.936** 0.931** 0.930**
7. NOx        1 0.962** 0.962**
8. Torque         1 1.000**
9. Brake power          1
  1. ** p < 0.05, * p < 0.1