File:Bostonh sqhetres.svg

Summary[edit]

R program:

library("mlbench")
data(BostonHousing)
x <- subset(BostonHousing, (BostonHousing$medv<50) & (BostonHousing$rm>=4))
svg("bostonh_sqhetres.svg", width=10, height=5)
par(mfrow=c(1,3))
plot(x$rm, x$medv, xlab="Mitt. Anzahl der Räume", ylab="Kaufpreis (in Tsd. US$)", main="Lineare Regression")
fit <- lm(medv ~ rm , data=x)
abline(fit, lwd=2) 
pos <- which.max(x$rm)
lines(c(x$rm[pos], x$rm[pos]), c(fit$fitted.values[pos], x$medv[pos]), col="red")
plot(x$rm, fit$residuals, xlab="Mitt. Anzahl der Räume", ylab="Residuen", main="Heteroskedastische Residuen") 
abline(h=0, lwd=2)
lines(c(x$rm[pos], x$rm[pos]), c(0, fit$residuals[pos]), col="red")
plot(x$rm, fit$residuals^2, xlab="Mitt. Anzahl der Räume", ylab="Quadrierte Residuen",  main="Fit der quadrierten Residuen")
l<-lowess(x$rm, fit$residuals^2)
lines(l, col="red", lwd=2)
dev.off()

 

This W3C-unspecified chart was created with R.

Licensing[edit]

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