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我正在尝试使用 stat_smoth 在 ggplot2 上拟合三阶多项式,但希望通过已知的 x 截距强制回归线(以下可重现示例为 35)。

例子:

x<-c(1,2,3,5,10,12,15,20,22,25,30,33,37)
y<-c(1000,800,100,10,1,0.3,0.25,0.2,0.1,0.1,0.03,0.05,0.03)
myformula<-y ~ poly(x,3)
ggplot(df, aes(x,y)) + stat_smooth(method = lm, formula = myformula) + geom_point() + 
stat_smooth(method = lm, formula = myformula) +
stat_poly_eq(formula = myformula, eq.with.lhs = "italic(psi)~`=`~",
                                  eq.x.rhs = "~italic(theta)", 
                                  aes(label = paste(..eq.label.., ..rr.label.., 
                                  sep = "~~~~")), label.x=0.15, parse = TRUE)+ 
xlim(0, 40)+  ylim(0, 2000)+ 
scale_y_log10(breaks = c(0, 0.1,10,1000), labels= c(0,0.1, 10,1000))

在此处输入图像描述

当 x 截距为 35 时,如何获得最佳拟合回归线和方程?另外,我怎样才能让线接触x轴?

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