Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Greg Snow
> Sent: Thursday, November 18, 2010 1:11 PM
> To: casperyc; r-help at r-project.org
> Subject: Re: [R] how exactly does 'identify' work?
>
> Did you read the help page for qqnorm? The return value has the x and
> y coordinates used, you can just do something like:
>
> > tmp <- qqnorm( resid(test.lm) )
> > identify(tmp, , names(resid(test.lm)) )
>
> Or the plot.lm function has an argument id.n that automatically labels
> the n most extreme values:
>
> > plot( test.lm, 2, id.n=10 )
>
> Those both worked in my tests, if they are not working for you then
> send a reproducible example (include data, see ?dput) and maybe we can
> help further.
>
> --
> Gregory (Greg) L. Snow Ph.D.
> Statistical Data Center
> Intermountain Healthcare
> greg.snow at imail.org
> 801.408.8111
>
>
> > -----Original Message-----
> > From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> > project.org] On Behalf Of casperyc
> > Sent: Thursday, November 18, 2010 11:50 AM
> > To: r-help at r-project.org
> > Subject: Re: [R] how exactly does 'identify' work?
> >
> >
> > Hi,
> >
> > I think the problem is
> >
> > 1 - when a linear model is fitted, ploting the qqnorm( test.lm$ res )
> > we dont 'know' what values are actually being used on the y-axis; and
> > how do we refer to the ?Index? on the x-axis??
> > therefore, i dont know how to refer to the x and y coordinates
> in
> > the
> > identify function
> >
> > 2 - i have tried using the stdres function in the MASS library, to
> > extract
> > the standardised
> > residuals and plot them manully, ( using the plot ) function.
> > this way, the problem is we have to SORT the residuals first in
> > increasing order to reproduce the same qqnorm plot, in that case,
> > 'identify'
> > function works, however, that CHANGES the order, i.e. it wont return
> > the
> > original A:Z ( row.names ) label.
> > --
> > View this message in context: http://r.789695.n4.nabble.com/how-
> > exactly-does-identify-work-tp3045953p3049357.html
> > Sent from the R help mailing list archive at Nabble.com.
> >
> > ______________________________________________
> > R-help at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-
> > guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.