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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