[R] Plot residuals against standard normal distribution

[Mikael Olai Milhøj]

Thx - this was exactly what I needed. Yes I also prefer the qqnorm but I
like the distrubution chart as well.
Thx !


/Mikael

On Tue, Feb 3, 2015 at 12:18 AM, peter dalgaard <pdalgd at gmail.com> wrote:

>
> > On 02 Feb 2015, at 23:42 , Mikael Olai Milhøj <mikaelmilhoj at gmail.com>
> wrote:
> >
> > Hi,
> >
> > I'm having trouble trying to plot the density of the residuals against
> the
> > standard normal distribution N(0,1). (I'm trying to see if my residuals
> are
> > well-behaved).
> >
> > I know hwo to calculate the standardized residuals (I guess that there
> may
> > be a simple way using a R function) and then plot this by using the
> density
> > function
> >
> > y<-(model$residuals-mean(model$residuals))/sd(model$residuals)
> > plot(density(y))
> >
> > But I don't know how to add the N(0,1) curve. Any suggestions? Thanks in
> > advance
>
> I'd try
>
> curve(dnorm(x), add=TRUE)
>
> Some diddling of ylim= is usually required.
>
>
> I'd usually prefer qqnorm() for normality checks, though; it is pretty
> hard to assess the tails of density plots.
>
> Also notice rstandard(), rstudent().
>
> -pd
>
> >
> >
> > /Mikael
> >
> >       [[alternative HTML version deleted]]
> >
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>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
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