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Table 2 Input variables, the coded values and the experimental results for biodiesel yield

From: A novel design for biodiesel production from methanol + mutton bone fat mixture

Run

M/O (X1)

Catalyst concentration ((wt %) X2)

Catalyst type (X3)

Yield (%)

1

2

0

− 1

57.78

2

0

0

1

76.90

3

0

0

− 1

80.53

4

− 1

− 1

− 1

87.93

5

0

− 2

1

59.76

6

2

0

1

87.62

7

0

2

1

86.87

8

0

2

− 1

54.61

9

1

− 1

1

78.46

10

− 1

1

1

72.32

11

− 2

0

1

66.92

12

1

− 1

− 1

77.23

13

− 1

-1

1

71.70

14

0

0

1

78.35

15

0

0

− 1

79.12

16

1

1

1

89.74

17

− 1

1

− 1

72.32

18

− 2

0

− 1

82.72

19

0

− 2

− 1

81.14

20

1

1

− 1

63.43