Table 7 ANOVA summary for multivariable regression models.

From: Multi-criteria decision-based optimization and multivariable regression analysis of date palm fiber reinforced concrete modified with silica fume under normal and elevated temperatures

Models

SS

MS

SE

F-value

P-value

R2

Adj R2

Fresh density (kg/m3)

306854.8

61,371

35.94

47.503

3.93 × 10− 14

0.878

0.86

Unit weight (kg/m3)

209713.66

41942.7

26.73

58.716

1.82 × 10− 15

0.899

0.884

Compressive strength (MPa)

2272.54

454.5

4.21

25.614

1.78 × 10− 10

0.795

0.764

Split tensile strength (MPa)

6.519

1.304

0.18

40.615

3.61 × 10− 13

0.86

0.839

Flexural strength (MPa)

20.125

4.025

0.37

29.395

2.96 × 10− 11

0.817

0.789

Water absorption (%)

11.752

2.35

0.38

16.012

5.2 × 10− 8

0.708

0.664

Weight loss (200 °C) (%)

0.887

0.177

0.087

23.282

5.97 × 10− 8

0.779

0.746

Weight loss (800 °C) (%)

89.933

17.987

0.54

60.588

1.15 × 10− 15

0.902

0.887

Residual strength (200 °C) (MPa)

2120.64

424.128

3.48

34.958

2.88 × 10− 12

0.841

0.817

Residual strength (800 °C) (MPa)

670.35

134.07

1.53

57.47

2.49 × 10− 15

0.897

0.881

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