问题描述
我正在尝试将x * log(x)模型拟合到数据中.拟合成功完成，但是我很难解释所得的系数.这是我的代码的快照.
I'm trying to fit a x*log(x) model to the data. The fitting is performed successfully but I have difficulties in interpreting the resulting coefficients. Here a snapshot of my code.
x <- c(6, 11, 16, 21, 26, 31, 36, 41, 46, 51)
y <- c(5.485, 6.992, 7.447, 8.134, 8.524, 8.985, 9.271, 9.647, 10.561, 9.971)
fit <- lm(y ~ x*log(x))
coef(fit)
> (Intercept) x log(x) x:log(x)
3.15224227 0.10020022 1.12588040 -0.01322249
我应该如何解释这些系数?我们称它们为a，b，c，d.我应该将它们放在公式"x * log(x)"的何处?
How I should interpret these coefficients? Let's call them a,b,c,d. Where I should put them in the formula "x*log(x)"?
推荐答案
按照书面规定，您所适合的模型是
As written, the model you are fitting is
E(y) = a + b*x + c*log(x) + d*x*log(x)
如果您确实想拟合模型a + b*x*log(c*x)，则需要弄清楚a + b*x*(log(c)+log(x)) = a + b*log(c)*x + b*x*log(x)，拟合y ~ x + x:log(x)，并相应地对参数进行反计算.
If you really did want to fit the model a + b*x*log(c*x) you would need to figure out that a + b*x*(log(c)+log(x)) = a + b*log(c)*x + b*x*log(x), fit y ~ x + x:log(x), and back-calculate the parameters accordingly.
或者您可能对y~I(x*log(x))感兴趣?
您实际上想要适合的模型是什么?
What is the model you actually want to fit?
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