[R] How do I plot: regression line, regression line + s.d, regression line - s.d on the same chart?

[ONKELINX, Thierry]

Another option is to use ggplot2

Dataset <- data.frame(x = runif(100, -5, 5))
Dataset$y <- 3 + 2 * Dataset$x + rnorm(100, sd = 2) 
library(ggplot2)
ggplot(Dataset, aes(x = x, y = y)) + geom_smooth(method = "lm") +
geom_point()


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Dimitris Rizopoulos
Verzonden: dinsdag 11 augustus 2009 11:24
Aan: Jorgy Porgee
CC: r-help at r-project.org
Onderwerp: Re: [R] How do I plot: regression line, regression line +
s.d, regression line - s.d on the same chart?

have a look at predict.lm() and specifically at the 'interval' argument
-- check also the following

x <- runif(100, -5, 5)
y <- 3 + 2 * x + rnorm(100, sd = 2)

fit <- lm(y ~ x)
xx <- seq(min(x), max(x), length.out = 30) pred <- predict(fit, newdata
= data.frame(x = xx), interval = "p")

plot(x, y)
matlines(xx, pred, lty = c(1, 2, 2), col = "red")


I hope it helps.

Best,
Dimitris


Jorgy Porgee wrote:
> Hello all,
> I've got a scatter plot, for which I create a regression line using:
> reg<- lm(yvars~xvars) and can plot the regression through the scatter 
> just fine.
> I'd like to add two additional lines on the scatter plot: one being
> regressionline+standard deviation, the other being
> regressionline-standard deviation, thus creating some kind of 'band'
> for the scatter.
> 
> Any help will be much appreciated. Thanking you in advance,
> 
> George.
> 
> ______________________________________________
> 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.
> 

--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014

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