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Table 6 Multiple regression coefficients.

From: Carbonation Model and Prediction of Polyvinyl Alcohol Fiber Concrete with Fiber Length and Content Effects

Coefficients \(a_{1}\) \(a_{2}\) \(a_{3}\) \(a_{4}\) R2
Linear model − 0.0219 − 0.9500    0.062
Quadratic model 0.0111 − 3.5231 0.0005 1.9239 0.943