A DOE (Response Surface Methodology) Approach to Predict the Strength Properties of Concrete Incorporated with Jute and Bamboo Fibres and Silica Fumes

Table 6

Proportion of variance (R²) of the regression model.

Responses	R^2 (%)	Adjusted R^2 (%)	Predicted R^2 (%)	Difference between adjusted R^2 and predicted R^2 (%)	value
Compressive strength	97.23	92.24	88.23	4	≤0.001
Compressive strength	98.27	95.16	89.13	6	≤0.001
Split tensile strength	92.23	88.22	81.23	7	0.003
Split tensile strength	96.29	89.90	80.23	10	0.001