Analyze formula (11) further, perform curve fitting on σ(X_i) in function F_2, and get the first-order fitting curve σ(X_i )=0.9522⋅X_i-20.25 and the second-order fitting curve σ(X_i )=0.001836 ⋅〖X_i〗^2-0.5242⋅X_i+275, as shown in Figure 7. The correlation coefficient between the weight coefficient and the single factor is more obvious, which proves the geometric significance of formula (11).
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