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After substituting the unstandardized coefficients from Table 1 into the multiple regression model, the linear prediction model for infiltration reduction is:
formula
3
The coefficient of each independent variable in model II is listed in Table 2.
Table 2

Coefficients of stepwise regression equations of the non-linear model

Step 5(Constant)PTDD2CCS2QACWPH2
 6.012 0.032 −1.980 −0.001 0.225 6.125 × 10−5 
Step 5(Constant)PTDD2CCS2QACWPH2
 6.012 0.032 −1.980 −0.001 0.225 6.125 × 10−5 

Dependent variable: Y = Ln.

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