在R中用LOESS拟合一条线 [英] Fit a line with LOESS in R

问题描述

我有一个包含一些点的数据集，并且想在上面放一条线.我尝试使用loess函数.不幸的是，我得到了非常奇怪的结果.参见下面的情节.我希望有一条线能够贯穿点和整个情节.我该如何实现?

I have a data set with some points in it and want to fit a line on it. I tried it with the loess function. Unfortunately I get very strange results. See the plot bellow. I expect a line that goes more through the points and over the whole plot. How can I achieve that?

如何复制它:

从(仅两个kb)，并使用以下代码:

Download the dataset from https://www.dropbox.com/s/ud32tbptyvjsnp4/data.R?dl=1 (only two kb) and use this code:

load(url('https://www.dropbox.com/s/ud32tbptyvjsnp4/data.R?dl=1'))
lw1 = loess(y ~ x,data=data)
plot(y ~ x, data=data,pch=19,cex=0.1)
lines(data$y,lw1$fitted,col="blue",lwd=3)

任何帮助将不胜感激.谢谢！

Any help is greatly appreciated. Thanks!

推荐答案

您已经针对y而不是针对x绘制了拟合值.同样，您将需要在绘制线之前对x值进行排序.试试这个:

You've plotted fitted values against y instead of against x. Also, you will need to order the x values before plotting a line. Try this:

lw1 <- loess(y ~ x,data=data)
plot(y ~ x, data=data,pch=19,cex=0.1)
j <- order(data$x)
lines(data$x[j],lw1$fitted[j],col="red",lwd=3)

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