如何创建一个图表来显示R中的预测模型，数据和残差 [英] How to create a graph showing the predictive model, data and residuals in R

问题描述

给出两个变量x和y，我对这些变量进行了dynlm回归，并想针对其中一个变量绘制拟合模型，并在底部绘制残差，以显示实际数据线与预测线.我曾经看过它，也曾经做过，但是对于我一生来说，我不记得该怎么做或找到任何能解释它的东西.

这使我进入了拥有一个模型和两个变量的球场，但我无法获得想要的图形类型.

library(dynlm)
x <- rnorm(100)
y <- rnorm(100)
model <- dynlm(x ~ y)

plot(x, type="l", col="red")
lines(y, type="l", col="blue")

我想生成一个看起来像这样的图形，在该图形中，您可以看到模型和真实数据相互重叠，而残差则作为单独的图形绘制在底部，以显示真实数据和模型如何偏离.

解决方案

这应该可以解决问题:

library(dynlm)
set.seed(771104)
x <- 5 + seq(1, 10, len=100) + rnorm(100)
y <- x + rnorm(100)
model <- dynlm(x ~ y)

par(oma=c(1,1,1,2))
plotModel(x, model) # works with models which accept 'predict' and 'residuals'

这是plotModel的代码，

plotModel =  function(x, model) {
  ymodel1 = range(x, fitted(model), na.rm=TRUE)
  ymodel2 = c(2*ymodel1[1]-ymodel1[2], ymodel1[2])
  yres1   = range(residuals(model), na.rm=TRUE)
  yres2   = c(yres1[1], 2*yres1[2]-yres1[1])
  plot(x, type="l", col="red", lwd=2, ylim=ymodel2, axes=FALSE,
       ylab="", xlab="")
  axis(1)
  mtext("residuals", 1, adj=0.5, line=2.5)
  axis(2, at=pretty(ymodel1))
  mtext("observed/modeled", 2, adj=0.75, line=2.5)
  lines(fitted(model), col="green", lwd=2)
  par(new=TRUE)
  plot(residuals(model), col="blue", type="l", ylim=yres2, axes=FALSE, 
       ylab="", xlab="")
  axis(4, at=pretty(yres1))
  mtext("residuals", 4, adj=0.25, line=2.5)
  abline(h=quantile(residuals(model), probs=c(0.1,0.9)), lty=2, col="gray")
  abline(h=0)
  box()  
}

Given two variables, x and y, I run a dynlm regression on the variables and would like to plot the fitted model against one of the variables and the residual on the bottom showing how the actual data line differs from the predicting line. I've seen it done before and I've done it before, but for the life of me I can't remember how to do it or find anything that explains it.

This gets me into the ballpark where I have a model and two variables, but I can't get the type of graph I want.

library(dynlm)
x <- rnorm(100)
y <- rnorm(100)
model <- dynlm(x ~ y)

plot(x, type="l", col="red")
lines(y, type="l", col="blue")

I want to generate a graph that looks like this where you see the model and the real data overlaying each other and the residual plotted as a separate graph on the bottom showing how the real data and the model deviate.

解决方案

This should do the trick:

library(dynlm)
set.seed(771104)
x <- 5 + seq(1, 10, len=100) + rnorm(100)
y <- x + rnorm(100)
model <- dynlm(x ~ y)

par(oma=c(1,1,1,2))
plotModel(x, model) # works with models which accept 'predict' and 'residuals'

and this is the code for plotModel,

plotModel =  function(x, model) {
  ymodel1 = range(x, fitted(model), na.rm=TRUE)
  ymodel2 = c(2*ymodel1[1]-ymodel1[2], ymodel1[2])
  yres1   = range(residuals(model), na.rm=TRUE)
  yres2   = c(yres1[1], 2*yres1[2]-yres1[1])
  plot(x, type="l", col="red", lwd=2, ylim=ymodel2, axes=FALSE,
       ylab="", xlab="")
  axis(1)
  mtext("residuals", 1, adj=0.5, line=2.5)
  axis(2, at=pretty(ymodel1))
  mtext("observed/modeled", 2, adj=0.75, line=2.5)
  lines(fitted(model), col="green", lwd=2)
  par(new=TRUE)
  plot(residuals(model), col="blue", type="l", ylim=yres2, axes=FALSE, 
       ylab="", xlab="")
  axis(4, at=pretty(yres1))
  mtext("residuals", 4, adj=0.25, line=2.5)
  abline(h=quantile(residuals(model), probs=c(0.1,0.9)), lty=2, col="gray")
  abline(h=0)
  box()  
}

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