Is it normal distributed?

Question

My Error's plot from a linear regression

enter image description here .

Is it Normal distributted? If not, why? What that negative big bar means?

The code used is:

  library(MASS)
sresid <- studres(reg3) 
hist(sresid, freq=FALSE, 
     main="Distribution of Studentized Residuals")
xfit<-seq(min(sresid),max(sresid),length=40) 
yfit<-dnorm(xfit) 
lines(xfit, yfit)

Edited:

enter image description here

score 1 · Answer 1 · edited Apr 13 '17 at 12:44

1

A histogram is not the best graph to do this. You are better of using a Q-Q plot, e.g. Regression - How do I know if my residuals are normally distributed?.

If you do that, I suspect you will see that an important deviation from normality/Gaussianity is that the residuals are right-skewed.

edited Apr 13 '17 at 12:44

Community

1

answered May 07 '14 at 11:37

Maarten Buis

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Ill add the qq-plot – user44400 May 07 '14 at 11:49
1

The QQ plot shows that @Maarten 's suspicions are confirmed. There is a long right tail. – Peter Flom May 07 '14 at 12:10

Is it normal distributed?

1 Answers1