Jun Shen
2015-Jan-27 01:58 UTC
[R] How to add error bars to a line xyplot (lattice package)
Dear list, I have a couple of lines (superimposed) in an xyplot and just want to add error bars to each of the data point. It's been a while since this question was asked last time. But the segplot from latticeExtra is not straight forward. Just wonder if there is a better way to do this. Appreciate for any comment. Thanks. Jun [[alternative HTML version deleted]]
Jim Lemon
2015-Jan-27 05:28 UTC
[R] How to add error bars to a line xyplot (lattice package)
Hi Jun,
Here is one way to do this using the mtcars data set, although there
are probably better ways.
mtcars$sd<-runif(32,1,2)
mpgxhp<-xyplot(mpg~hp,mtcars,
main="Miles per gallon by horsepower",
xlab="Horsepower",ylab="Miles per gallon",
panel=function(x,y,ulim,llim) {
yspace<-diff(range(y))/100
headlen<-par("pin")[1]/100
panel.arrows(x,y+yspace,x,y+mtcars$sd,angle=90,length=headlen)
panel.arrows(x,y-yspace,x,y-mtcars$sd,angle=90,length=headlen)
panel.xyplot(x,y)
}
)
print(mpgxhp)
Jim
On Tue, Jan 27, 2015 at 12:58 PM, Jun Shen <jun.shen.ut at gmail.com>
wrote:> Dear list,
>
> I have a couple of lines (superimposed) in an xyplot and just want to add
> error bars to each of the data point. It's been a while since this
question
> was asked last time. But the segplot from latticeExtra is not straight
> forward. Just wonder if there is a better way to do this. Appreciate for
> any comment. Thanks.
>
> Jun
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
William Revelle
2015-Jan-27 16:09 UTC
[R] How to add error bars to a line xyplot (lattice package)
You might want to look at the examples in error.bars.by in the psych package. Bill> On Jan 26, 2015, at 7:58 PM, Jun Shen <jun.shen.ut at gmail.com> wrote: > > Dear list, > > I have a couple of lines (superimposed) in an xyplot and just want to add > error bars to each of the data point. It's been a while since this question > was asked last time. But the segplot from latticeExtra is not straight > forward. Just wonder if there is a better way to do this. Appreciate for > any comment. Thanks. > > Jun > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. >William Revelle http://personality-project.org/revelle.html Professor http://personality-project.org Department of Psychology http://www.wcas.northwestern.edu/psych/ Northwestern University http://www.northwestern.edu/ Use R for psychology http://personality-project.org/r It is 3 minutes to midnight http://www.thebulletin.org
Kevin Wright
2015-Jan-27 22:56 UTC
[R] How to add error bars to a line xyplot (lattice package)
See segplot in the latticeExtra package. Kevin On Mon, Jan 26, 2015 at 7:58 PM, Jun Shen <jun.shen.ut at gmail.com> wrote:> Dear list, > > I have a couple of lines (superimposed) in an xyplot and just want to add > error bars to each of the data point. It's been a while since this question > was asked last time. But the segplot from latticeExtra is not straight > forward. Just wonder if there is a better way to do this. Appreciate for > any comment. Thanks. > > Jun > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.-- Kevin Wright
Bert Gunter
2015-Jan-27 23:08 UTC
[R] How to add error bars to a line xyplot (lattice package)
Well, the OP already referred to segplot. But, see, he shouldn't be doing this plot in the first place. Yes, I know it's fairly standard in science, but it's a bad idea (as are many others, like the infamous "dynamite plot"). If uncertainty intervals are desired, they should be model based, obtained,e.g. by the relevant predict() method. But this is OT for here, so I won't rant further. Cheers, Bert Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." Clifford Stoll On Tue, Jan 27, 2015 at 2:56 PM, Kevin Wright <kw.stat at gmail.com> wrote:> See segplot in the latticeExtra package. > > Kevin > > On Mon, Jan 26, 2015 at 7:58 PM, Jun Shen <jun.shen.ut at gmail.com> wrote: >> Dear list, >> >> I have a couple of lines (superimposed) in an xyplot and just want to add >> error bars to each of the data point. It's been a while since this question >> was asked last time. But the segplot from latticeExtra is not straight >> forward. Just wonder if there is a better way to do this. Appreciate for >> any comment. Thanks. >> >> Jun >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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. > > > > -- > Kevin Wright > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.