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:

sresid <- studres(reg3) 
hist(sresid, freq=FALSE, 
     main="Distribution of Studentized Residuals")
lines(xfit, yfit)


enter image description here


1 Answer 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.

  • $\begingroup$ Ill add the qq-plot $\endgroup$
    – user44400
    May 7, 2014 at 11:49
  • 1
    $\begingroup$ The QQ plot shows that @Maarten 's suspicions are confirmed. There is a long right tail. $\endgroup$
    – Peter Flom
    May 7, 2014 at 12:10

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