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Table 4 RSM of PET-FA expression

From: Meta-analysis on PET plastic as concrete aggregate using response surface methodology and regression analysis

Source

DF

Adj SS

Adj MS

F-Value

P-Value

Expression

12

8220.25

685.021

180.12

0.000

 Linear

5

3737.72

747.544

196.56

0.000

  Cement

1

250.43

250.427

65.85

0.000

  CA

1

53.75

53.746

14.13

0.000

  FA

1

9.13

9.130

2.40

0.128

  W/C

1

17.05

17.052

4.48

0.040

  PET(%)

1

225.68

225.678

59.34

0.000

 Square

2

314.57

157.287

41.36

0.000

  CA*CA

1

153.68

153.682

40.41

0.000

  W/C*W/C

1

137.42

137.416

36.13

0.000

 2-Way Interaction

5

685.42

137.084

36.05

0.000

  Cement*CA

1

33.52

33.520

8.81

0.005

  Cement*FA

1

51.86

51.864

13.64

0.001

  Cement*PET(%)

1

212.39

212.389

55.85

0.000

  CA*PET(%)

1

10.53

10.530

2.77

0.103

  FA*PET(%)

1

29.69

29.695

7.81

0.008

Error

47

178.74

3.803

  

Total

59

8398.99

   

RMSE

 

1.726

   

R2

 

0.9787

   

R2 adj

 

0.9733

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